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Implementation Checker for TIFF
<?xml version="1.0" encoding="UTF-8"?>
<implementationCheckerObject xmlns="http://www.dpfmanager.org/ProfileChecker"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.dpfmanager.org/ProfileChecker ProfileChecker.xsd">
<title>Baseline TIFF 6.0</title>
<iso>TIFF 6.0 Specification. Part 1: Baseline TIFF</iso>
<description>Baseline TIFF (Part 1) is the core of TIFF, the essentials that all mainstream TIFF developers
should support in their products.
Baseline TIFF image is capable of describing bilevel, grayscale, palette-color, and full-color RGB images.
Tiff Revision 6.0 Final - June 3, 1992</description>
<version>1.0.0</version>
<author>Easy Innova</author>
<date>2016-09-20</date>
<rules id="IFH">
<title>validation rules for the TIFF IFH</title>
<description>A TIFF file begins with an 8-byte image file header(IFH), containing the following information:
Bytes 0-1: The byte order used within the file. Legal values are: “II” (4949.H) for little-endian and “MM” (4D4D.H) for big-endian.
Bytes 2-3: An arbitrary but carefully chosen number (42) that further identifies the file as aTIFF file.
Bytes 4-7: The offset (in bytes) of the first IFD. The directory may be at any location in the file after the header but must begin on a word boundary.</description>
<rule id="IFH-0001" context="tiffValidationObject" level="critical">
<title>TIFF file begins with an IFH</title>
<description>A TIFF file begins with an 8-byte Image File Header(IFH) that points to and image file directory(IFD)</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{count(header)==1}">TIFF must start with an unique Image File Header</assert>
</rule>
<rule id="IFH-0002" context="header" level="critical">
<title>TIFF IFH contains the byte order</title>
<description>TIFF Image File Header(IFH) must contain the byte order used within the file (IFD Bytes 0 to 1). Legal values are "II" for Little Endian or "MM" for Big Endian byte order</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{byteOrder}">Byte Order must be defined</assert>
</rule>
<rule id="IFH-0003" context="header" level="critical">
<title>TIFF IFH contains a valid byte order</title>
<description>TIFF Image File Header(IFH) must contain the byte order used within the file (IFD Bytes 0 to 1). Legal values are "II" for Little endian or "MM" for Big Endian byte order</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{byteOrder=='BIG_ENDIAN'}||{byteOrder=='LITTLE_ENDIAN'}">Byte Order must be BIG_ENDIAN or LITTLE_ENDIAN</assert>
</rule>
<rule id="IFH-0004" context="header" level="critical">
<title>IFH contains the TIFF signature</title>
<description>TIFF Image File Header(IFH) must contain the number 42 (IFD Bytes 2 to 3). An arbitrary but carefully chosen number that further identifies the file as a TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{magicNumber}">TIFF signature must be defined</assert>
</rule>
<rule id="IFH-0005" context="header" level="critical">
<title>TIFF signature is the number 42</title>
<description>TIFF Image File Header(IFH) must contain the number 42 (IFD Bytes 2 to 3). An arbitrary but carefully chosen number that further identifies the file as a TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{magicNumber==42}">TIFF signature is not correct (The TIFF signature must be 42)</assert>
</rule>
<rule id="IFH-0006" context="header" level="critical">
<title>First IFD offset refers out of the file</title>
<description>The byte offset of the first IFD may refer at any location in the file after the Image File Header(IFH), respect to the beginning of the TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset < $tiffValidationObject.size$}">First IFD bad offset position out of TIFF file, probably corrupted file.</assert>
</rule>
<rule id="IFH-0007" context="header" level="critical">
<title>First IFD offset refers inside the IFH</title>
<description>The byte offset of the first IFD may refer at any location in the file after the Image File Header(IFH)</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset > 7}||{offset == 0}">First IFD bad offset position inside the Image File Header(IFH), probably corrupted file.</assert>
</rule>
<rule id="IFH-0008" context="header" level="error">
<title>First IFD offset begin on a word boundary</title>
<description>The byte offset may refer at any location in the file after the Image File Header(IFH) but must begin on a word boundary</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset%2==0}">Bad word alignment in offset</assert>
</rule>
</rules>
<rules id="IFD">
<title>validation rules for the TIFF Image File Directory(IFD)</title>
<description>An Image File Directory (IFD) consists of a 2-byte count of the number of directory
entries (i.e., the number of fields), followed by a sequence of 12-byte field
entries, followed by a 4-byte offset of the next IFD (or 0 if none).
There must be at least 1 IFD in a TIFF file and each IFD must have at least one
entry.</description>
<rule id="IFD-0001" context="ifds" level="error">
<title>TIFF file must have at least one IFD</title>
<description>There must be at least one Image File Directory(IFD) in a TIFF file and each IDF must have at least one entry</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{count(ifd) > 0}">TIFF file must have at least one Image File Directory</assert>
</rule>
<rule id="IFD-0002" context="tiffValidationObject" level="error">
<title>IFD must have at least one entry</title>
<description>There must be at least one Image File Directory(IFD) in a TIFF file and each IDF must have at least one entry</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{count(ifds) == 1}">Image File Directory must have at least one entry</assert>
</rule>
<rule id="IFD-0003" context="tags" level="critical">
<title>IFD must have at least one entry</title>
<description>There must be at least one Image File Directory(IFD) in a TIFF file and each IDF must have at least one entry</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{tagsCount > 0}">Image File Directory must have at least one entry</assert>
</rule>
<rule id="IFD-0004" context="tags" level="error">
<title>IFD must have at least one entry</title>
<description>There must be at least one Image File Directory(IFD) in a TIFF file and each IDF must have at least one entry</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{count(tag) > 0}">Image File Directory must have at least one entry</assert>
</rule>
<rule id="IFD-0005" context="tags" level="critical" experimental="true">
<title>Number of directory entry not match with the file entries</title>
<description>Number of directory entry not match with the file entries</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{tagsCount == count(tag)}">Number of directory entry must be the same that the directories entries</assert>
</rule>
<rule id="IFD-0006" context="ifd" level="error">
<title>Duplicate tag inside one IDF</title>
<description>The entries in an Image File Directory(IFD) must be in strictly ascending order by tag although the values witch directory entry points need not be in any particular order.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>15</page></reference>
<assert test="{duplicateTags == 0}">Tags cannot be duplicated inside an IFD because the entries in an Image File Directory(IFD) must be in strictly ascending order</assert>
</rule>
<rule id="IFD-0007" context="ifd" level="error">
<title>IFD entry must be sorted in strictly ascending order</title>
<description>The entries in an Image File Directory(IFD) must be in strictly ascending order by tag although the values witch directory entry points need not be in any particular order.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>15</page></reference>
<assert test="{tagOrdering == 1}">Tags must be in strict ascending order</assert>
</rule>
<rule id="IFD-0008" context="ifd" level="error" experimental="true">
<title>IFD entry must have a cardinality</title>
<description>An entries in an Image File Directory(IFD) must have a cardinality greater than zero.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>15</page></reference>
<assert test="{cardinality > 0}">IDF entry with invalid cardinality</assert>
</rule>
<rule id="IFD-0009" context="ifd" level="critical">
<title>IFD offset refers to a location out of the file</title>
<description>The byte offset of the first IFD may refer at any location in the file after the Image File Header(IFH), respect to the beginning of the TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{offset < $tiffValidationObject.size$}">IFD bad offset position refers to a location out of the file, probably corrupted file.</assert>
</rule>
<rule id="IFD-0010" context="ifd" level="critical">
<title>IFD offset refers to a location inside the IFH</title>
<description>The byte offset of the first IFD may refer at any location in the file after the Image File Header(IFH)</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{offset > 7}||{offset == 0}">IFD bad offset position refers to a location inside the Image File Header(IFH), probably corrupted file.</assert>
</rule>
<rule id="IFD-0011" context="ifd[last]" level="error" experimental="true">
<title>Last IFD offset must be 4 bytes of 0 </title>
<description>The last IFD offset must be 4 bites of 0 </description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{offset==0}">The Last IFD offset must be 4 bites of 0</assert>
</rule>
<rule id="IFD-0012" context="ifd" level="error">
<title>IFD offset begin on a word boundary</title>
<description>The byte offset may refer at any location in the file after the Image File Header(IFH) but must begin on a word boundary</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{offset%2==0}">Bad word alignment in offset</assert>
</rule>
<rule id="IFD-00013" context="exif" level="error">
<title>EXIF IFD offset begin on a word boundary</title>
<description>The byte offset may refer at any location in the file after the Image File Header(IFH) but must begin on a word boundary</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>14</page></reference>
<assert test="{offset%2==0}">Bad word alignment in offset</assert>
</rule>
<rule id="IFD-0014" context="ifds" level="critical">
<title>IFD circular reference</title>
<description>Next Image File Directory(IFD) offset should not refers to a previous IFD because no data should be referenced form more than one place.</description>
<reference><document>TIFF Baseline 6</document><section>Section 7: Additional Baseline TIFF Requirements</section><page>26</page></reference>
<assert test="{circularReference == 0}">Image File Directory offset refers to a previous IFD creating circular reference</assert>
</rule>
<rule id="IFD-0015" context="ifd[class=image]" level="warning">
<title>More than 10 private tags in one IFD</title>
<description>If you need more than 10 tags, we suggest that you reserve a single private tag and use its value as a pointer (offset) to a
private IFD or other data structure of your choosing. Within that IFD, you can use
whatever tags you want, since no one else will know that it is an IFD unless you
tell them.</description>
<reference><document>TIFF Baseline 6</document><section>TIFF Administration</section><paragraph>1</paragraph><page>9</page></reference>
<assert test="{count(tags.tag[privateTag=private]) > 10}">More than 10 private tags in one IFD</assert>
</rule>
<rule id="IFD-0016" context="count (ifd[class=image]) > 1" level="info" experimental="true">
<title>More than 1 on IFD in the TIFF file</title>
<description>There may be more than one IFD in a TIFF file but for Baseline TIFF readers is not required to read any IFDs beyond the first one, so not all readers could render all the images in the file</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><paragraph>7</paragraph><pages>16</pages></reference>
<assert test="{count(ifds) > 1}">There is more than one IFD in the TIFF file. some readers will only render the first one</assert>
</rule>
<rule id="IFD-0017" context="ifd[class=image]" level="error">
<title>Check valid extra samples components</title>
<description>Check valid extra samples components</description>
<reference><document>TIFF Baseline 6</document><section>Section 8</section><page>31</page></reference>
<assert test="{correctExtraSamples == 1}">Incorrect Extra Samples Count</assert>
</rule>
<rule id="IFD-0018" context="ifd[class=image]" level="error">
<title>Check not unused extra samples present</title>
<description>Check not unused extra samples present</description>
<reference><document>TIFF Baseline 6</document><section>Section 8</section><page>31</page></reference>
<assert test="{onlyNecessaryExtraSamples == 1}">Unnecessary Extra Samples</assert>
</rule>
<rule id="IFD-0019" context="ifd[class=image]" level="error">
<title>Check valid Bits per Sample values</title>
<description>Check valid Bits per Sample values</description>
<reference><document>TIFF Baseline 6</document><section>Section 8</section><page>29</page></reference>
<assert test="{validBitsPerSample == 1}">Invalid Bits per Sample</assert>
</rule>
</rules>
<rules id="IFDE">
<title>Validation rules for the TIFF Image File Directory Entry(IFD)</title>
<description>Each 12-byte IFD entry has the following format:
Bytes 0-1 The Tag that identifies the field.
Bytes 2-3 The field Type.
Bytes 4-7 The number of values, Count of the indicated Type.
Bytes 8-11 The Value Offset, the file offset (in bytes) of the Value for the field.
The Value is expected to begin on a word boundary; the corresponding Value Offset will thus be an even number.
This file offset may point anywhere in the file, even after the image data.</description>
<rule id="IFDE-0001" context="" level="error" experimental="true">
<title>invalid IFDE type</title>
<description>The field types and their sizes are:
1 = BYTE 8-bit unsigned integer.
2 = ASCII 8-bit byte that contains a 7-bit ASCII code; the last byte must be NUL (binary zero).
3 = SHORT 16-bit (2-byte) unsigned integer.
4 = LONG 32-bit (4-byte) unsigned integer.
5 = RATIONAL Two LONGs: the first represents the numerator of a fraction; the second, the denominator.
6 = SBYTE An 8-bit signed (twos-complement) integer.
7 = UNDEFINED An 8-bit byte that may contain anything, depending on the definition of the field.
8 = SSHORT A 16-bit (2-byte) signed (twos-complement) integer.
9 = SLONG A 32-bit (4-byte) signed (twos-complement) integer.
10 = SRATIONAL Two SLONG’s: the first represents the numerator of a fraction, the second the denominator.
11 = FLOAT Single precision (4-byte) IEEE format.
12 = DOUBLE Double precision (8-byte) IEEE format.
To store a complicated data structure in a private tag, use the UNDEFINED field type and set the Count to the number of bytes required to hold the data structure.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><pages>15-16</pages></reference>
<assert test="{tagtype > 0} && {tagtype < 13}">Invalid TIFF type, this type is not defined in the Baseline 6.0</assert>
</rule>
<rule id="IDFE-0002" context="tag[type=ASCII]" level="error">
<title>Valid ASCII characters</title>
<description>8-bit byte that contains a 7-bit ASCII code; the last byte must be NUL (binary zero).</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><paragraph>7</paragraph><page>15</page></reference>
<assert test="{asci7==true}">Only 7-bit ASCII codes are accepted</assert>
</rule>
<rule id="IDFE-0003" context="tag[type=ASCII]" level="error">
<title>ASCII strings terminated with NUL (binary zero)</title>
<description>Any ASCII field can contain multiple strings, each terminated with a NUL.
A single string is preferred whenever possible. The Count for multi-string fields is the number of bytes in all the strings in that field plus their terminating NUL bytes.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><paragraph>1</paragraph><page>16</page></reference>
<assert test="{lastByte==0}">ASCII strings must terminate with NUL</assert>
</rule>
<rule id="IDFE-0004" context="tag[type=ASCII]" level="error">
<title>Only one NUL is allowed between ASCII strings</title>
<description>Only one NUL is allowed between strings, so that the strings following the first string will often begin on an odd byte.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><paragraph>1</paragraph><page>16</page></reference>
<assert test="{duplicatedNuls==false}">Only one NUL is allowed between ASCII strings</assert>
</rule>
</rules>
<rules id="IFDI">
<title>Validation rules for an image IFD</title>
<description>This section contains all the common rules for and image IFD </description>
<rule id="IFDI-0001" context="ifd[class=image]" level="error">
<title>An image IFD must have a Photometric Interpretation</title>
<description>There is no default value for Photometric Interpretation tag, so it is required for an Image File Directory that contains and image data</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation]}">An Image IFD must have a Photometric Interpretation tag</assert>
</rule>
<rule id="IFDI-0002" context="ifd[class=image]" level="error">
<title>An image IFD must have a Image Length</title>
<description>An image Image File Directory(IFD) that contains and image data must have a Image Length value</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=ImageLength]}">Image IFD must have a Length tag</assert>
</rule>
<rule id="IFDI-0003" context="ifd[class=image]" level="error">
<title>An image IFD must have a Image Width</title>
<description>An image Image File Directory(IFD) that contains and image data must have a Image Width value</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=ImageWidth]}">Image IFD must have a Width tag</assert>
</rule>
<rule id="IFDI-0004" context="ifd[class=image]" level="error">
<title>An image IFD must have a X Resolution value</title>
<description>An Image File Directory(IFD) that contains and image data must have a X Resolution value</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=XResolution]}">Image IFD must have tag X Resolution</assert>
</rule>
<rule id="IFDI-0005" context="ifd[class=image]" level="error">
<title>An image IFD must have a Y Resolution value</title>
<description>An Image File Directory(IFD) that contains and image data must have a Y Resolution value</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=YResolution]}">Image IFD must have tag Y Resolution</assert>
</rule>
<rule id="IFDI-0006" context="ifd[class=image]" level="error" experimental="true">
<title>Valid BitsPerSample and SamplesPerPixel</title>
<description>The total number of BitsPerSample must be the same as SamplesPerPixel</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=BitsPerSample].cardinality == tags.tag[name=SamplesPerPixel]}">BitsPerSample cardinality must match with SamplesPerPixel</assert>
</rule>
<rule id="IFDI-0008" context="ifd[class=image]" level="error" experimental="true">
<title>Ifd with ExtraSamples</title>
<description>When and Extra Sample is defined then BitsPerSample and SamplesPerPixel must be defined.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=ExtraSamples]} || {tags.tag[name=BitsPerSample]} && {tags.tag[name=SamplesPerPixel]}">BitsPerSample and SamplesPerPixel must be defined when an ExtraSample is declared</assert>
</rule>
</rules>
<rules id="STRIPS">
<title>Strips Images</title>
<description>Compressed or uncompressed image data can be stored almost anywhere in a TIFF file. TIFF also supports breaking an image into separate strips for increased editing flexibility and efficient I/O buffering.
The location and size of each strip is given by the following fields; StripOffsets, StripBYTECount, RowsPerStrip.
</description>
<rule id="STRIPS-0001" context="ifd[class=image]" level="error">
<title>An image IFD should have a StripOffsets</title>
<description>An Image File Directory(IFD) that contains and image data must have StripOffsets values</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{tags.tag[name=StripOffsets]}">Image IFD must have the tag StripOffsets</assert>
</rule>
<rule id="STRIPS-0002" context="ifd[class=image]" level="error">
<title>An image IFD should have a StripBYTECount</title>
<description>An Image File Directory(IFD) that contains and image data must have StripBYTECount</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette-color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>19</page></reference>
<assert test="{tags.tag[name=StripBYTECount]}">Image IFD must have the tag StripBYTECount</assert>
</rule>
<rule id="STRIPS-0003" context="ifd[strips=1]" level="error">
<title>Strips sizes match image dimensions</title>
<description>strips structure must match with the image width and height</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>19</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{correctStrips == 1} || {correctStrips == -1}">Image width and image height do not match with strips sizes</assert>
</rule>
<rule id="STRIPS-0004" context="ifd[strips=1]" level="error">
<title>Strips check</title>
<description>Strips must be valid</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>19</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{correctStrips == 1} || {correctStrips == 0}">Strips offsets are invalid</assert>
</rule>
<rule id="STRIPS-0005" context="ifd[strips=1]" level="error">
<title>Inconsistent Strip lenght</title>
<description>The cardinality of striptOffsets and the cardinality of StripsBytesCount must be the same</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{tags.tag[name=StripOffsets].cardinality == tags.tag[name=StripBYTECount].cardinality}">Inconsistent strip lengths, The cardinality of striptOffsets and StripsBytesCount must match</assert>
</rule>
</rules>
<rules id="IFDB">
<title>Validation rules for IFD Image Bilevel (Class B)</title>
<description>A bilevel image contains two colors—black and white. TIFF allows an application to write out bilevel data in either a white-is-zero or black-is-zero format.
Baseline TIFF bilevel images were called TIFF Class B images in earlier versions of the TIFF specification.</description>
<rule id="IFDB-0001" context="ifd[type=Bilevel]" level="error">
<title>Valid Photometric Interpretation value</title>
<description>The Photometric Interpretation tag for bilevel images must have a valid value.
0 = WhiteIsZero. For bilevel and grayscale images: 0 is imaged as white.
1 = BlackIsZero. For bilevel and grayscale images: 0 is imaged as black.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>17</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] > -1} && {tags.tag[name=PhotometricInterpretation] < 2}">Photometric Interpretation value must be 0 or 1</assert>
</rule>
<rule id="IFDB-0002" context="ifd[type=Bilevel]" level="error">
<title>Valid image compression</title>
<description>The compression tag for bilevel images must have a valid value.
1 = No compression.
2 = CCITT Group 3 1-Dimensional Modified Huffman run length encoding.
32773 = PackBits compression, a simple byte-oriented run length scheme.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>17</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 3: Bilevel Images</section><page>21</page></reference>
<assert test="{tags.tag[name=Compression] > 0} && {tags.tag[name=Compression] < 3} || {tags.tag[name=Compression] == 32773}">Invalid Compression for Bilevel image</assert>
</rule>
<rule id="IFDB-0003" context="ifd[type=Bilevel]" level="error" experimental="true">
<title>Valid BitsPerSample and SamplesPerPixel</title>
<description>When No Extra Sample is defined then BitsPerSample cardinality and SamplesPerPixel must be 1 for Bilevel Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{tags.tag[name=ExtraSamples]} || (({tags.tag[name=BitsPerSample] == 1} || !tags.tag[name=BitsPerSample] ) && ({tags.tag[name=SamplesPerPixel] == 1} || {!tags.tag[name=SamplesPerPixel]} )">BitsPerSample and BitsPerSample should be 1 for Bilevel images without ExtraSamples</assert>
</rule>
<rule id="IFDB-0004" context="ifd[type=Bilevel]" level="error" experimental="true">
<title>Valid BitsPerSample and SamplesPerPixel with ExtraSample</title>
<description>When an Extra Sample is defined 1 sample is required for Bilevel Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=ExtraSamples]} || {tags.tag[name=BitsPerSample] - tags.tag[name=ExtraSamples].cardinality == 1}">When an Extra Sample is defined 1 sample is required for Bilevel Images.</assert>
</rule>
<rule id="IFDB-0005" context="ifd[type=Bilevel]" level="warning">
<title>Bilevel image display reversed</title>
<description>When in a Bilevel image 0 is imaged as black and 2**BitsPerSample-1 is imaged as white.
If Compression is 2 (CCITT Group 3 1-Dimensional Modified Huffman run-length encoding) the image should display and print reversed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=Compression] == 2} && {tags.tag[name=PhotometricInterpretation] == 1}">Some TIFF readers could display a Bilevel image compressed with CCITT reversed colors</assert>
</rule>
</rules>
<rules id="IDFG">
<title>Validation rules for IFD Image Grayscale (Class G)</title>
<description>Grayscale images are a generalization of bilevel images. Bilevel images can store only black and white image data, but grayscale images can also store shades of gray.
Baseline TIFF grayscale images were called TIFF Class G images in earlier versions of the TIFF specification.</description>
<rule id="IFDG-0001" context="ifd[type=Grayscale]" level="error">
<title>Valid Photometric Interpretation value</title>
<description>The Photometric Interpretation tag for grayscale images must have a valid value.
0 = WhiteIsZero. For bilevel and grayscale images: 0 is imaged as white.
1 = BlackIsZero. For bilevel and grayscale images: 0 is imaged as black.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] > -1} && {tags.tag[name=PhotometricInterpretation] < 2}">Photometric Interpretation value must be 0 or 1</assert>
</rule>
<rule id="IDFG-0001" context="ifd[type=Grayscale]" level="error">
<title>Valid compression for grayscale image</title>
<description>In Baseline TIFF, grayscale images can
either be stored as uncompressed data or compressed with the PackBits algorithm</description>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<assert test="{tags.tag[name=Compression] == 1} || {tags.tag[name=Compression] == 32773}">Invalid Compression for Grayscale image</assert>
</rule>
<rule id="IDFG-0002" context="ifd[type=Grayscale]" level="info">
<title>Grayscale image with PackBits Compression</title>
<description>PackBits is often ineffective on continuous tone images, including many
grayscale images. In such cases, it is better to leave the image uncompressed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 4: Grayscale Images</section><page>22</page></reference>
<assert test="{tags.tag[name=Compression] == 32773}">PackBits is often ineffective on grayscale images. It is better to leave the image uncompressed.</assert>
</rule>
<rule id="IDFG-0003" context="ifd[type=Grayscale]" level="error" experimental="true">
<title>Valid bits per sample and samples per Pixel</title>
<description>When No Extra Sample is defined then BitsPerSample must be 4 or 8 and SamplesPerPixel must be 1 for Grayscale Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{tags.tag[name=ExtraSamples]} || {tags.tag[name=BitsPerSample] == 4} || {tags.tag[name=BitsPerSample] == 8} && ( {!tags.tag[name=SamplesPerPixel]} || {tags.tag[name=SamplesPerPixel] == 1})">BitsPerSample must be 4 or 8 and BitsPerSample must be 1 for Grayscale images without ExtraSamples</assert>
</rule>
<rule id="IFDG-0004" context="ifd[type=Bilevel]" level="error" experimental="true">
<title>Valid BitsPerSample and SamplesPerPixel with ExtraSample</title>
<description>When an Extra Sample is defined then 1 sample is required for Grayscale Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=ExtraSamples]} || {tags.tag[name=BitsPerSample] - tags.tag[name=ExtraSamples].cardinality == 1}">1 sample is required to define Grayscale images with ExtraSamples</assert>
</rule>
</rules>
<rules id="IFDP">
<title>Validation rules for IFD Image Palette Color</title>
<description>Palette-color have one component per pixel, but the component value is used as an index into a full RGB-lookup table.
Baseline TIFF palette-color images were called TIFF Class P images in earlier versions of the TIFF specification.</description>
<rule id="IFDP-0001" context="ifd[type=Palette]" level="error">
<title>Valid Photometric Interpretation value</title>
<description>
The Photometric Interpretation tag for Palette Color images must have a valid value.
3 = Palette Color.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 5:Palette Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] == 3}">Photometric Interpretation value must be 3</assert>
</rule>
<rule id="IFDP-0002" context="ifd[type=Palette]" level="error">
<title>Valid compression for palette color image</title>
<description>In Baseline TIFF, palette color images can either be stored as uncompressed data or compressed with the PackBits algorithm.</description>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=Compression] == 1} || {tags.tag[name=Compression] == 32773}">Invalid Compression for palette color image</assert>
</rule>
<rule id="IFDP-0003" context="ifd[type=Palette]" level="error">
<title>Valid BitsPerSample for palette color image</title>
<description>Allowable values for Baseline TIFF palette color images are 4 and 8, allowing either 16 or 256 distinct colors.</description>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=BitsPerSample] == 4} || {tags.tag[name=BitsPerSample] == 8}">Invalid Bits per Sample for palette color image</assert>
</rule>
<rule id="IFDP-0004" context="ifd[type=Palette]" level="error" experimental="true">
<title>Palette image SamplesPerPixel must be 1</title>
<description>Palette image can not contain ExtraSamples SamplesPerPixel must be 1.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{!tags.tag[name=SamplesPerPixel]} || {tags.tag[name=SamplesPerPixel] == 1}">Palette image can not contain ExtraSamples, SamplesPerPixel must be 1.</assert>
</rule>
<rule id="IFDP-0005" context="ifd[type=Palette]" level="error">
<title>Color Map is required for palette color image</title>
<description>This field defines a Red-Green-Blue color map (often called a lookup table) for palette color images.
In a TIFF ColorMap, all the Red values come first, followed by the Green values, then the Blue values. In the ColorMap, black is represented by 0,0,0 and white is represented by 65535, 65535, 65535.</description>
<reference><document>TIFF Baseline 6</document><section>Section 5: Palette Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=ColorMap]}">Color Map must be included in palette color images</assert>
</rule>
</rules>
<rules id="IFDR">
<title>Validation rules for RGB Full color images</title>
<description>In an RGB image, each pixel is made up of three components: red, green, and blue. There is no ColorMap.
To describe an RGB image, you need to add or change the following fields and values. The other required fields are the same as those required for palette-color images.
The BitsPerSample values listed above apply only to the main image data. If ExtraSamples are present, the appropriate BitsPerSample values for those samples must also be included.
Baseline TIFF RGB images were called TIFF Class R images in earlier versions of the TIFF specification.</description>
<rule id="IFDR-0001" context="ifd[type=RGB]" level="error">
<title>Valid Photometric Interpretation value for RGB image</title>
<description>The Photometric Interpretation tag for RGB images must have a valid value. 2 = RGB.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] == 2}">Photometric Interpretation value must be 2</assert>
</rule>
<rule id="IFDR-0002" context="ifd[type=RGB]" level="error">
<title>Valid compression for RGB image</title>
<description>In Baseline TIFF, RGB images can
either be stored as uncompressed data or compressed with the PackBits algorithm.</description>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=Compression] == 1} || {tags.tag[name=Compression] == 32773}">Invalid Compression for RGB image</assert>
</rule>
<rule id="IDFR-0003" context="ifd[type=RGB]" level="info">
<title>RGB image with PackBits Compression</title>
<description>PackBits is often ineffective on continuous tone images, including many
RGB images. In such cases, it is better to leave the image uncompressed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 6: RGB Full Color Images</section><page>23</page></reference>
<assert test="{tags.tag[name=Compression] == 32773}">PackBits is often ineffective on RGB images. It is better to leave the image uncompressed.</assert>
</rule>
<rule id="IDFR-0004" context="ifd[type=RGB]" level="error" experimental="true">
<title>Valid bits per sample and samples per Pixel</title>
<description>When No Extra Sample is defined then BitsPerSample must be 4 or 8 and SamplesPerPixel must be 3 for palette colo Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=ExtraSample]} || {tags.tag[name=BitsPerSample] == '8,8,8'} && {tags.tag[name=SamplesPerPixel] == 3)}">BitsPerSample must be 4 or 8 and BitsPerSample must be 3 for palette color image wihout ExtraSamples</assert>
</rule>
<rule id="IFDG-0005" context="ifd[type=RGB]" level="error" experimental="true">
<title>Valid BitsPerSample and SamplesPerPixel with ExtraSample</title>
<description>When an Extra Sample is defined then 3 sample is required for RGB Images.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=ExtraSamples]} || {tags.tag[name=BitsPerSample] - tags.tag[name=ExtraSamples].cardinality == 3}">3 samples are required to define RGB images with ExtraSamples</assert>
</rule>
</rules>
<rules id="IFDT">
<title>Validation rules for IFD with alpha transparency</title>
<description>Validation rules for IFD with alpha transparency</description>
<rule id="IFDT-0001" context="ifd[type=Transparency]" level="error">
<title>Valid Photometric Interpretation value</title>
<description>The Photometric Interpretation tag for Transparency mask must have a valid value. 4 = Transparency Mask.
This means that the image is used to define an irregularly shaped region of another image in the same TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] == 4}">Photometric Interpretation value must be 4</assert>
</rule>
<rule id="IFDT-0002" context="ifd[type=Transparency]" level="error">
<title>Valid BitsPerSample for Transparency Mask </title>
<description>For Transparency Mask SamplesPerPixel and BitsPerSample must be 1.
The 1-bits define the interior of the region and the 0-bits define the exterior of the region</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=BitsPerSample] == 1}">Invalid Bits per Sample for Transparency Mask image</assert>
</rule>
<rule id="IFDT-0003" context="ifd[type=Transparency]" level="error">
<title>valid SamplesPerPixel for Transparency Mask</title>
<description>For Transparency Mask SamplesPerPixel and BitsPerSample must be 1.
The 1-bits define the interior of the region and the 0-bits define the exterior of the region</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=SamplesPerPixel] == 1}">Invalid Samples per Pixel for Transparency Mask image</assert>
</rule>
<rule id="IFDT-0004" context="ifd[type=Transparency]" level="info">
<title>Compression for Transparency Mask</title>
<description> PackBits compression is recommended for Transparency Mask</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=Compression] != 32773}">PackBits compression is recommended for Transparency Mask</assert>
</rule>
</rules>
<rules id="OFFSET">
<title>validation rules for TIFF Offsets</title>
<description>No Duplicate Pointers. No data should be referenced from more than one place.
TIFF readers and editors are under no obligation to detect this condition and handle it properly. This would not be a problem if TIFF files were read-only entities, but they are not.
This warning covers both TIFF field value offsets and fields that are defined as offsets, such as StripOffsets.
Point to real data. All strip offsets must reference valid locations. (It is not legal to use an offset of 0 to mean something special.)</description>
<rule id="OFFSET-0001" context="tag" level="error">
<title>Offset begin on a word boundary</title>
<description>The byte offset may refer at any location in the file after the Image File Header(IFH) but must begin on a word boundary</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset%2==0}">Bad word alignment in offset</assert>
</rule>
<rule id="OFFSET-0002" context="tag" level="critical">
<title>Offset refers to a location out of the file</title>
<description>The byte offset may refer ar any location in the file after the Image File Header(IFH), respect to the beginning of the TIFF file.</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset < $tiffValidationObject.size$}">Bad offset position, probably corrupted file.</assert>
</rule>
<rule id="OFFSET-0003" context="tag" level="critical">
<title>Offset refers to a location inside the IFH</title>
<description>The byte offset may refer ar any location in the file after the Image File Header(IFH)</description>
<reference><document>TIFF Baseline 6</document><section>Section 2: TIFF Structure</section><page>13</page></reference>
<assert test="{offset > 7}||{offset == 0}">Bad offset position</assert>
</rule>
<rule id="OFFSET-0004" context="*" level="error">
<title>Duplicate pointers</title>
<description>No data should be referenced form more than one place. This warning covers both TIFF field value offsets and fields that are defined as offsets</description>
<reference><document>TIFF Baseline 6</document><section>Section 7: Additional Baseline TIFF Requirements</section><page>26</page></reference>
<assert test="{usedOffset==false}">Duplicate pointer</assert>
</rule>
<rule id="OFFSET-0005" context="*" level="error">
<title>Data already referenced</title>
<description>No data should be referenced form more than one place. This warning covers both TIFF field value offsets and fields that are defined as offsets</description>
<reference><document>TIFF Baseline 6</document><section>Section 7: Additional Baseline TIFF Requirements</section><page>26</page></reference>
<assert test="{offsetOverlap==false}">Data already referenced</assert>
</rule>
</rules>
<rules id="TAG-315">
<title>Artist</title>
<description>Person who created the image.
Tag = 315 (13B.H)
Type = ASCII
No default
Note: some older TIFF files used this tag for storing Copyright information.</description>
<rule id="TAG-315-0001" context="tag[id=315]" level="error">
<title>Artist tag valid Type</title>
<description>Artist Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>28</page></reference>
<assert test="{type=='ASCII'}">Artist Tag type is not valid, an ASCII type is expected</assert>
</rule>
<rule id="TAG-315-0002" context="ifd[class=image]" level="info">
<title>Artist storing Copyright information</title>
<description>Some older TIFF files used this tag for storing Copyright information</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>28</page></reference>
<assert test="{!tags.tag[name=Copyright]} >> {count(tags.tag[name=Artist]) == 1} ">Some older TIFF files used this tag for storing Copyright information.</assert>
</rule>
</rules>
<rules id="TAG-258">
<title>BitsPerSample</title>
<description>Number of bits per component.
This field allows a different number of bits per component for each component corresponding to a pixel.
Tag = 258 (102.H)
Type = SHORT
N = SamplesPerPixel
Default = 1</description>
<rule id="TAG-258-0001" context="tag[id=258]" level="error">
<title>BitsPerSample valid Type</title>
<description>BitsPerSample Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{type=='SHORT'}">BitsPerSample type is not valid, an SHORT type is expected</assert>
</rule>
<rule id="TAG-258-0002" context="ifd[class=image]" level="error">
<title>BitsPerSample valid cardinality</title>
<description>The cardinality of the number of bits per componet must be the same as SamplesPerPixel value</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=BitsPerSample].cardinality == tags.tag[name=SamplesPerPixel]}">BitsPerSample must have a cardinality according to BitsPerSample</assert>
</rule>
<rule id="TAG-258-0003" context="ifd" level="warning">
<title>BitsPerSample requires and image IFD</title>
<description>BitsPerSample should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=BitsPerSample]} && {class != 'image'}">BitsPerSample should only be used in an image IFD</assert>
</rule>
<rule id="TAG-258-0004" context="ifd[class=image]" level="info">
<title>BitsPerSample default value</title>
<description>BitsPerSample tag has a default value, if it is not present value 1 bit per sample is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{!tags.tag[name=BitsPerSample]}">BitsPerSample Tag is not defined. Then 1 bit per sample is assumed.</assert>
</rule>
</rules>
<rules id="TAG-265">
<title>CellLength</title>
<description>The length of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.
Tag = 265 (109.H)
Type = SHORT
N = 1
No default
This field should only be present if Threshholding = 2</description>
<rule id="TAG-265-0001" context="tag[id=265]" level="error">
<title>CellLength valid Type</title>
<description>CellLength Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{type=='SHORT'}">CellLength type is not valid, an SHORT type is expected</assert>
</rule>
<rule id="TAG-265-0002" context="tag[id=265]" level="error">
<title>CellLength valid cardinality</title>
<description>The cardinality of the CellLength tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{cardinality==1}">CellLength must have a 1 cardinality</assert>
</rule>
<rule id="TAG-265-0003" context="ifd[type=Bilevel]" level="error">
<title>CellLength tag only if Threshholding is 2</title>
<description>CellLength should only be present if Threshholding is 2</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{!tags.tag[name=CellLength]} || {tags.tag[name=Threshholding] == 2}">CellLength should only be present if Threshholding is 2</assert>
</rule>
<rule id="TAG-265-0004" context="ifd" level="warning">
<title>CellLength only in Bilevel images</title>
<description>CellLength should only be used in an image IFD defining a bilevel image</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=CellLength]} && {type != 'Bilevel'}">CellLength should only be used in an image IFD defining a bilevel image</assert>
</rule>
</rules>
<rules id="TAG-264">
<title>CellWidth</title>
<description>The width of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.
Tag = 264 (109.H)
Type = SHORT
N = 1
No default
This field should only be present if Threshholding = 2</description>
<rule id="TAG-264-0001" context="tag[id=264]" level="error">
<title>CellWidth valid Type</title>
<description>CellWidth Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{type=='SHORT'}">CellWidth type is not valid, an SHORT type is expected</assert>
</rule>
<rule id="TAG-264-0002" context="tag[id=264]" level="error">
<title>CellWidth valid cardinality</title>
<description>The cardinality of the CellWidth tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{cardinality==1}">CellWidth must have a 1 cardinality</assert>
</rule>
<rule id="TAG-264-0003" context="ifd[type=Bilevel]" level="error">
<title>CellWidth tag only if Threshholding is 2</title>
<description>CellWidth should only be present if Threshholding is 2</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{!tags.tag[name=CellWidth]} || {tags.tag[name=Threshholding] == 2}">CellWidth should only be present if Threshholding is 2</assert>
</rule>
<rule id="TAG-264-0004" context="ifd" level="warning">
<title>CellWidth only in palette images</title>
<description>CellWidth should only be used in an image IFD defining a bilevel image</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=CellWidth]} && {type != 'Bilevel'}">CellWidth should only be used in an image IFD defining a bilevel image</assert>
</rule>
</rules>
<rules id="TAG-320">
<title>ColorMap</title>
<description>A color map for palette color images. This field defines a Red-Green-Blue color map (often called a lookup table) for palette-color images. In a palette-color image, a pixel value is used to index into
an RGB lookup table.
In a TIFF ColorMap, all the Red values come first, followed by the Green values, then the Blue values. The number of values for each color is 2**BitsPerSample.
Therefore, the ColorMap field for an 8-bit palette-color image would have 3 * 256 values.
The width of each value is 16 bits, as implied by the type of SHORT. 0 represents the minimum intensity, and 65535 represents the maximum intensity. Black is represented by 0,0,0, and white by 65535, 65535, 65535.
ColorMap must be included in all palette-color images.
Tag = 320 (140.H)
Type = SHORT
N = 3 * (2**BitsPerSample)
No default</description>
<rule id="TAG-320-0001" context="tag[id=320]" level="error">
<title>ColorMap valid Type</title>
<description>ColorMap Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{type=='SHORT'}">ColorMap type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-320-0002" context="ifd[type=Palette]" level="error">
<title>ColorMap valid cardinality</title>
<description>The cardinality of the ColorMap tag must be 3 * (2**BitsPerSample)</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=ColorMap].cardinality == 3*2^tags.tag[name=BitsPerSample]}">The cardinality of the ColorMap tag must be 3 * (2**BitsPerSample)</assert>
</rule>
<rule id="TAG-320-0003" context="ifd" level="warning">
<title>ColorMap only in palette images</title>
<description>ColorMap should only be used in an image IFD defining a palette image</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=ColorMap]} && {type != 'Palette'}">ColorMap should only be used in an image IFD defining a palette image</assert>
</rule>
</rules>
<rules id="TAG-259">
<title>Compression</title>
<description>Compression scheme used on the image data.
Tag = 259 (103.H)
Type = SHORT
N = 1
Default = 1
Currently defined values are:
1 = No compression
2 = CCITT Group 3 1-Dimensional Modified Huffman run-length encoding. this type of compression is defined only for bilevel images.
32773 = PackBits compression, a simple byte-oriented run-length scheme.</description>
<rule id="TAG-259-0001" context="tag[id=259]" level="error">
<title>Compression valid Type</title>
<description>Compression Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>30</page></reference>
<assert test="{type=='SHORT'}">Compression type is not valid, an SHORT type is expected</assert>
</rule>
<rule id="TAG-259-0002" context="tag[id=259]" level="error">
<title>Compression valid cardinality</title>
<description>The cardinality of the Compression tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>30</page></reference>
<assert test="{cardinality==1}">Compression must have a 1 cardinality</assert>
</rule>
<rule id="TAG-259-0003" context="ifd" level="error">
<title>Valid Compression value</title>
<description>The Compression tag must have a valid value.
1 = No compression
2 = CCITT Group 3 1-Dimensional Modified Huffman run-length encoding.
32773 = PackBits compression, a simple byte-oriented run-length scheme
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>30-31</pages></reference>
<assert test="{tags.tag[name=Compression] > 0} && {tags.tag[name=Compression] < 3} || {tags.tag[name=Compression] == 32773}">The Compression tag must have a valid value</assert>
</rule>
<rule id="TAG-259-0004" context="ifd[class=image]" level="error">
<title>Compression CCITT for bilevel images</title>
<description>CCITT Group 3 1-Dimensional Modified Huffman run-length encoding compression is defined
only for bilevel images and BitsPerSample must be 1
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>30</page></reference>
<assert test="{tags.tag[name=Compression] != 2} || {tags.tag[name=BitsPerSample] == 1}">CCITT compression is defined
only for bilevel images and BitsPerSample must be 1</assert>
</rule>
<rule id="TAG-259-0005" context="ifd" level="warning">
<title>Compression requires and image ifd</title>
<description>Compression should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>29</page></reference>
<assert test="{tags.tag[name=Compression]} && {class != 'image'}">Compression should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-33432">
<title>Copyright</title>
<description>Copyright notice of the person or organization that claims the copyright to the image.
The complete copyright statement should be listed in this field including any dates and statements of claims.
Tag = 33432 (8298.H)
Type = ASCII
No default</description>
<rule id="TAG-33432-0001" context="tag[id=33432]" level="error">
<title>Copyright tag valid Type</title>
<description>Copyright Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>31</page></reference>
<assert test="{type=='ASCII'}">Copyright Tag type is not valid, an ASCII type is expected</assert>
</rule>
</rules>
<rules id="TAG-306">
<title>DateTime</title>
<description>Date and time of image creation.
Tag = 306 (132.H)
Type = ASCII
N = 20
No default
The format is: “YYYY:MM:DD HH:MM:SS”, with hours like those on a 24-hour clock, and one space character between the date and the time.
The length of the string, including the terminating NUL, is 20 bytes.</description>
<rule id="TAG-306-0001" context="tag[id=306]" level="error">
<title>DateTime tag valid Type</title>
<description>DateTime Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>31</page></reference>
<assert test="{type=='ASCII'}">DateTime Tag type is not valid, an ASCII type is expected</assert>
</rule>
<rule id="TAG-306-0002" context="tag[id=306]" level="error">
<title>DateTime valid cardinality</title>
<description>The cardinality of the DateTime tag must be 20</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>31</page></reference>
<assert test="{cardinality==20}">DateTime cardinality is not valid, cardinality should be 20</assert>
</rule>
<rule id="TAG-306-0003" context="ifd" level="error">
<title>DateTime valid format</title>
<description>The format is: “YYYY:MM:DD HH:MM:SS”, with hours like those on a 24-hour
clock, and one space character between the date and the time</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>31</page></reference>
<assert test="{date(tags.tag[name=DateTime])}">Incorrect format for DateTime</assert>
</rule>
</rules>
<rules id="TAG-338">
<title>ExtraSamples</title>
<description>Specifies that each pixel has m extra components whose interpretation is defined by one of the values listed below.
ExtraSamples is typically used to include non-color information, such as opacity, in an image.
Tag = 338 (152.H)
Type = SHORT
N = m
No default
Currently defined values are:
0 = Unspecified data
1 = Associated alpha data (with pre-multiplied color)
2 = Unassociated alpha data</description>
<rule id="TAG-338-0001" context="tag[id=338]" level="error">
<title>ExtraSamples tag valid Type</title>
<description>ExtraSamples Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>31-32</pages></reference>
<assert test="{type=='SHORT'}">ExtraSamples Tag type is not valid, a SHORT type is expected</assert>
</rule>
</rules>
<rules id="TAG-266">
<title>FillOrder</title>
<description>The logical order of bits within a byte.
Tag = 266 (10A.H)
Type = SHORT
N = 1
Default is 1.
Currently defined values are:
1 = pixels are arranged within a byte such that pixels with lower column values are stored in the higher-order bits of the byte.
2 = pixels are arranged within a byte such that pixels with lower column values are stored in the lower-order bits of the byte.
We recommend that FillOrder=2 be used only in special-purpose applications.
It is easy and inexpensive for writers to reverse bit order by using a 256-byte lookup table.
FillOrder = 2 should be used only when BitsPerSample = 1 and the data is either uncompressed or compressed using CCITT 1D or 2D compression, to
avoid potentially ambigous situations.
Support for FillOrder=2 is not required in a Baseline TIFF compliant reader</description>
<rule id="TAG-266-0001" context="tag[id=266]" level="error">
<title>FillOrder tag valid Type</title>
<description>FillOrder Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>32-33</pages></reference>
<assert test="{type=='SHORT'}">FillOrder Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-266-0002" context="tag[id=266]" level="error">
<title>FillOrder valid cardinality</title>
<description>The cardinality of the FillOrder tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>32-33</pages></reference>
<assert test="{cardinality==1}">FillOrder cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-266-0003" context="ifd[class=image]" level="warning">
<title>FillOrder pixels arrange in lower-order</title>
<description>FillOrder pixels are arranged within a byte such that pixels with lower column values are
stored in the lower-order bits of the byte. This configuration should only be used in special-purpose applications.
Support for FillOrder=2 is not required in a Baseline TIFF compliant reader.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>32</pages></reference>
<assert test="{tags.tag[name=FillOrder] == 2}">FillOrder with value 2 should only be used in special-purpose applications. Support for FillOrder=2 is not required in a Baseline TIFF compliant reader</assert>
</rule>
<rule id="TAG-266-0004" context="ifd[class=image]" level="error">
<title>FillOrder invalid pixels arrange in lower-order</title>
<description>FillOrder = 2 should be used only when BitsPerSample = 1 and the data is
either uncompressed or compressed using CCITT 1D or 2D compression, to
avoid potentially ambigous situations.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>32</pages></reference>
<assert test="{tags.tag[name=FillOrder] != 2} || {tags.tag[name=BitsPerSample] == 1} && {tags.tag[name=Compression] < 5}">FillOrder = 2 should be used only when BitsPerSample = 1 and the data is either uncompressed or compressed using CCITT</assert>
</rule>
<rule id="TAG-266-0005" context="ifd" level="warning">
<title>FillOrder requires and image ifd</title>
<description>FillOrder should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=FillOrder]} && {class != 'image'}">FillOrder should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-289">
<title>FreeByteCounts</title>
<description>For each string of contiguous unused bytes in a TIFF file, the number of bytes in the string.
Tag = 289 (121.H)
Type = LONG
Not recommended for general interchange.</description>
<rule id="TAG-289-0001" context="tag[id=289]" level="error">
<title>FreeByteCounts tag valid Type</title>
<description>FreeByteCounts Tag type must be LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33</pages></reference>
<assert test="{type=='LONG'}">FreeByteCounts Tag type is not valid, a LONG type is expected</assert>
</rule>
<rule id="TAG-289-0002" context="ifd" level="warning">
<title>FreeByteCounts not recommended for interchange</title>
<description>Tag FreeByteCounts is not recommended for general interchange</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33</pages></reference>
<assert test="{tags.tag[name=FreeByteCounts]}">Tag FreeByteCounts is not recommended for general interchange</assert>
</rule>
</rules>
<rules id="TAG-288">
<title>FreeOffsets</title>
<description>For each string of contiguous unused bytes in a TIFF file, the byte offset of the string.
Tag = 288 (120.H)
Type = LONG
Not recommended for general interchange.</description>
<rule id="TAG-288-0001" context="tag[id=288]" level="error">
<title>FreeOffsets tag valid Type</title>
<description>FreeOffsets Tag type must be LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33</pages></reference>
<assert test="{type=='LONG'}">FreeOffsets Tag type is not valid, a LONG type is expected</assert>
</rule>
<rule id="TAG-288-0002" context="ifd" level="warning">
<title>FreeOffsets not recommended for interchange</title>
<description>Tag FreeOffsets is not recommended for general interchange</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33</pages></reference>
<assert test="{tags.tag[name=FreeOffsets]}">Tag FreeOffsets is not recommended for general interchange</assert>
</rule>
</rules>
<rules id="TAG-291">
<title>GrayResponseCurve</title>
<description>For grayscale data, the optical density of each possible pixel value. The 0th value of GrayResponseCurve corresponds to the optical density of a pixel
having a value of 0, and so on.
Tag = 291 (123.H)
Type = SHORT
N = 2**BitsPerSample
This field may provide useful information for sophisticated applications, but it is
currently ignored by most TIFF readers.</description>
<rule id="TAG-291-0001" context="tag[id=291]" level="error">
<title>GrayResponseCurve tag valid Type</title>
<description>GrayResponseCurve Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>33</page></reference>
<assert test="{type=='SHORT'}">GrayResponseCurve Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-291-0002" context="ifd[class=image]" level="error">
<title>GrayResponseCurve valid cardinality</title>
<description>The cardinality of the GrayResponseCurve tag must be 2**BitsPerSample</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>33</page></reference>
<assert test="{tags.tag[name=GrayResponseCurve].cardinality == 2^tags.tag[name=BitsPerSample]}">GrayResponseCurve cardinality is not valid</assert>
</rule>
<rule id="TAG-291-0003" context="ifd" level="warning">
<title>GrayResponseCurve valid in Grayscale images </title>
<description>GrayResponseCurve is only usefull on Grayscale images</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>33</page></reference>
<assert test="{tags.tag[name=GrayResponseCurve]} && {type != 'Grayscale'}">GrayResponseCurve should only be used in Grayscale images</assert>
</rule>
<rule id="TAG-291-0004" context="ifd[type=Grayscale]" level="info">
<title>GrayResponseCurve ignored for readers</title>
<description>GrayResponseCurve may provide useful information for sophisticated applications, but it is
currently ignored by most TIFF readers</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>33</page></reference>
<assert test="{tags.tag[name=GrayResponseCurve]}">GrayResponseCurve it is currently ignored by most TIFF readers</assert>
</rule>
</rules>
<rules id="TAG-290">
<title>GrayResponseUnit</title>
<description>The precision of the information contained in the GrayResponseCurve.
Because optical density is specified in terms of fractional numbers, this field is necessary to interpret the stored integer information.
Optical densitometers typically measure densities within the range of 0.0 to 2.0.
Tag = 290 (122.H)
Type = SHORT
N = 1
For historical reasons, the default is 2. However, for greater accuracy, 3 is recommended.
Currently defined values are:
1 = Number represents tenths of a unit.
2 = Number represents hundredths of a unit.
3 = Number represents thousandths of a unit.
4 = Number represents ten-thousandths of a unit.
5 = Number represents hundred-thousandths of a unit.</description>
<rule id="TAG-290-0001" context="tag[id=290]" level="error">
<title>GrayResponseUnit tag valid Type</title>
<description>GrayResponseUnit Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33-34</pages></reference>
<assert test="{type=='SHORT'}">GrayResponseUnit Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-290-0002" context="tag[id=290]" level="error">
<title>GrayResponseUnit valid cardinality</title>
<description>The cardinality of the GrayResponseUnit tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33-34</pages></reference>
<assert test="{cardinality==1}">GrayResponseUnit cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-290-0003" context="ifd" level="warning">
<title>GrayResponseUnit valid in Grayscale images</title>
<description>GrayResponseUnit is only usefull on Grayscale images</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33-34</pages></reference>
<assert test="{tags.tag[name=GrayResponseUnit]} && {type != 'Grayscale'}">GrayResponseUnit is only useful on Grayscale images</assert>
</rule>
<rule id="TAG-290-0004" context="ifd[type=Grayscale]" level="warning">
<title>GrayResponseUnit requires GrayResponseCurve</title>
<description>GrayResponseUnit is only applicable if GrayResponseCurve is defined</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33-34</pages></reference>
<assert test="{!tags.tag[name=GrayResponseCurve]} && {tags.tag[name=GrayResponseUnit]}">GrayResponseUnit is only useful when GrayResponseCurve is defined</assert>
</rule>
<rule id="TAG-290-0005" context="ifd[type=Grayscale]" level="warning">
<title>GrayResponseUnit recomended value are thousandths</title>
<description>For historical reasons, the default is hundredths of a unit (value 2). However, for greater accuracy, thousandths of a unit (value 3) is recommended.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>33-34</pages></reference>
<assert test="{tags.tag[name=GrayResponseCurve]} && {tags.tag[name=GrayResponseUnit] != 3} || {!tags.tag[name=GrayResponseUnit]}">GrayResponseUnit For historical reasons, the default is 2. However, for greater accuracy, 3 is recommended.</assert>
</rule>
</rules>
<rules id="TAG-316">
<title>HostComputer</title>
<description>The computer and/or operating system in use at the time of image creation.
Tag = 316 (13C.H)
Type = ASCII
No default</description>
<rule id="TAG-316-0001" context="tag[id=316]" level="error">
<title>HostComputer tag valid Type</title>
<description>HostComputer Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{type=='ASCII'}">HostComputer Tag type is not valid, a ASCII type is expected</assert>
</rule>
</rules>
<rules id="TAG-270">
<title>ImageDescription</title>
<description>A string that describes the subject of the image.
Tag = 270 (10E.H)
Type = ASCII
No default</description>
<rule id="TAG-270-0001" context="tag[id=270]" level="error">
<title>ImageDescription tag valid Type</title>
<description>ImageDescription Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{type=='ASCII'}">ImageDescription Tag type is not valid, a ASCII type is expected</assert>
</rule>
<rule id="TAG-270-0002" context="ifd" level="warning">
<title>ImageDescription requires and image ifd</title>
<description>ImageDescription should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=ImageDescription]} && {class != 'image'}">ImageDescription should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-257">
<title>ImageLength</title>
<description>The number of rows of pixels in the image.
Tag = 257 (101.H)
Type = SHORT or LONG
N = 1
No default</description>
<rule id="TAG-257-0001" context="tag[id=257]" level="error">
<title>ImageLength tag valid Type</title>
<description>ImageLength Tag type must be SHORT or LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{type=='SHORT'} || {type=='LONG'}">ImageLength Tag type is not valid, a SHORT or LONG type is expected</assert>
</rule>
<rule id="TAG-257-0002" context="tag[id=257]" level="error">
<title>ImageLength valid cardinality</title>
<description>The cardinality of the ImageLength tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{cardinality==1}">ImageLength cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-257-0003" context="ifd[class=image]" level="warning">
<title>Valid Image Length</title>
<description>Although there is not an explicit reference in the TIFF Baseline, an image length should not be 0</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=ImageLength] == 0}">An image can not have a 0 length</assert>
</rule>
<rule id="TAG-257-0004" context="ifd" level="warning">
<title>ImageLength requires and image ifd</title>
<description>ImageLength should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=ImageWidth]} && {class != 'image'}">ImageLength should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-256">
<title>ImageWidth</title>
<description>The number of columns in the image, i.e., the number of pixels per row.
Tag = 256 (100.H)
Type = SHORT or LONG
N = 1
No default</description>
<rule id="TAG-256-0001" context="tag[id=256]" level="error">
<title>ImageWidth tag valid Type</title>
<description>ImageWidth Tag type must be SHORT or LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{type=='SHORT'} || {type=='LONG'}">ImageWidth Tag type is not valid, a SHORT or LONG type is expected</assert>
</rule>
<rule id="TAG-256-0002" context="tag[id=256]" level="error">
<title>ImageWidth valid cardinality</title>
<description>The cardinality of the ImageWidth tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{cardinality==1}">ImageWidth cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-256-0003" context="ifd[class=image]" level="warning">
<title>Valid ImageWidth</title>
<description>Although there is not an explicit reference in the TIFF Baseline, an image width should not be 0</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=ImageWidth] == 0}">An image can not have a 0 width</assert>
</rule>
<rule id="TAG-256-0004" context="ifd" level="warning">
<title>ImageWidth requires and image ifd</title>
<description>ImageWidth should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>34</page></reference>
<assert test="{tags.tag[name=ImageWidth]} && {class != 'image'}">ImageWidth should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-271">
<title>Make</title>
<description>Manufacturer of the scanner, video digitizer, or other type of equipment used to generate the image.
Synthetic images should not include this field.
Tag = 271 (10F.H)
Type = ASCII
No default</description>
<rule id="TAG-271-0001" context="tag[id=271]" level="error">
<title>Make tag valid Type</title>
<description>Make Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{type=='ASCII'}">Make Tag type is not valid, a ASCII type is expected</assert>
</rule>
</rules>
<rules id="TAG-281">
<title>MaxSampleValue</title>
<description>The maximum component value used.
Tag = 281 (119.H)
Type = SHORT
N = SamplesPerPixel
Default is 2**(BitsPerSample) - 1.
This field is not to be used to affect the visual appearance of an image when it is displayed or printed.
Nor should this field affect the interpretation of any other field; it is used only for statistical purposes.</description>
<rule id="TAG-281-0001" context="tag[id=281]" level="error">
<title>MaxSampleValue tag valid Type</title>
<description>MaxSampleValue Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{type=='SHORT'}">MaxSampleValue Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-281-0002" context="ifd[class=image]" level="error">
<title>MaxSampleValue valid cardinality</title>
<description>The cardinality of the MaxSampleValue tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MaxSampleValue].cardinality == tags.tag[name=SamplesPerPixel]}">MaxSampleValue cardinality is not valid, cardinality should match SamplesPerPixel</assert>
</rule>
<rule id="TAG-281-0003" context="ifd[class=image]" level="info">
<title>MaxSampleValue not affect visual appearance</title>
<description>This field is not to be used to affect the visual appearance of an image when it is
displayed or printed. Nor should this field affect the interpretation of any other
field; it is used only for statistical purposes</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MaxSampleValue]}">MaxSampleValue field is not to be used to affect the visual appearance of an image when it is
displayed or printed.</assert>
</rule>
<rule id="TAG-281-0004" context="ifd" level="warning">
<title>MaxSampleValue requires and image ifd</title>
<description>MaxSampleValue should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MaxSampleValue]} && {class != 'image'}">MaxSampleValue should only be used in an image IFD</assert>
</rule>
<rule id="TAG-281-0005" context="ifd[class=image]" level="info">
<title>MaxSampleValue default value</title>
<description>MaxSampleValue tag has a default value, if it is not present value 2**(BitsPerSample) - 1 is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{!tags.tag[name=MaxSampleValue]}">MaxSampleValue Tag is not defined. Then 2**(BitsPerSample) - 1 value is assumed</assert>
</rule>
</rules>
<rules id="TAG-280">
<title>MinSampleValue</title>
<description>The minimum component value used.
Tag = 280 (118.H)
Type = SHORT
N = SamplesPerPixel
Default is 0.
This field is not to be used to affect the visual appearance of an image when it is displayed or printed.
Nor should this field affect the interpretation of any other field; it is used only for statistical purposes.</description>
<rule id="TAG-280-0001" context="tag[id=280]" level="error">
<title> MinSampleValue tag valid Type</title>
<description> MinSampleValue Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{type=='SHORT'}"> MinSampleValue Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-280-0002" context="ifd" level="error">
<title> MinSampleValue valid cardinality</title>
<description>The cardinality of the MinSampleValue tag must be SamplesPerPixel</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MinSampleValue].cardinality == tags.tag[name=SamplesPerPixel]}"> MinSampleValue cardinality is not valid, cardinality should match SamplesPerPixel</assert>
</rule>
<rule id="TAG-280-0003" context="ifd" level="info">
<title>MinSampleValue not affect visual appearance</title>
<description>This field is not to be used to affect the visual appearance of an image when it is
displayed or printed. Nor should this field affect the interpretation of any other
field; it is used only for statistical purposes.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MinSampleValue]}">MinSampleValue his field is not to be used to affect the visual appearance of an image when it is
displayed or printed.</assert>
</rule>
<rule id="TAG-280-0004" context="ifd" level="warning">
<title>MinSampleValue requires and image ifd</title>
<description>MinSampleValue should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{tags.tag[name=MinSampleValue]} && {class != 'image'}">MinSampleValue should only be used in an image IFD</assert>
</rule>
<rule id="TAG-280-0005" context="ifd[class=image]" level="info">
<title>MinSampleValue default value</title>
<description>MinSampleValue tag has a default value, if it is not present value 0 is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{!tags.tag[name=MinSampleValue]}">MinSampleValue Tag is not defined. Then 0 value is assumed</assert>
</rule>
</rules>
<rules id="TAG-272">
<title>Model</title>
<description>The model name or number of the scanner, video digitizer, or other type of equipment used to generate the image.
Tag = 272 (110.H)
Type = ASCII
No default</description>
<rule id="TAG-272-0001" context="tag[id=272]" level="error">
<title>Model tag valid Type</title>
<description>Model Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>35</page></reference>
<assert test="{type=='ASCII'}">Model Tag type is not valid, a ASCII type is expected</assert>
</rule>
</rules>
<rules id="TAG-254">
<title>NewSubfileType</title>
<description>A general indication of the kind of data contained in this subfile.
Replaces the old SubfileType field, due to limitations in the definition of that field. NewSubfileType is mainly useful when there are multiple subfiles in a single TIFF file.
This field is made up of a set of 32 flag bits. Unused bits are expected to be 0. Bit 0 is the low-order bit.
Tag = 254 (FE.H)
Type = LONG
N = 1
Default is 0.
Currently defined values are:
Bit 0 is 1 if the image is a reduced-resolution version of another image in this TIFF file; else the bit is 0.
Bit 1 is 1 if the image is a single page of a multi-page image (see the PageNumber field description); else the bit is 0.
Bit 2 is 1 if the image defines a transparency mask for another image in this TIFF file. The PhotometricInterpretation value must be 4, designating a transparency mask.
These values are defined as bit flags because they are independent of each other.</description>
<rule id="TAG-254-0001" context="tag[id=254]" level="error">
<title>NewSubfileType tag valid Type</title>
<description>NewSubfileType Tag type must be LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{type=='LONG'}">NewSubfileType Tag type is not valid, a LONG type is expected</assert>
</rule>
<rule id="TAG-254-0002" context="tag[id=254]" level="error">
<title>NewSubfileType valid cardinality</title>
<description>The cardinality of the NewSubfileType tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{cardinality == 1}">NewSubfileType cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-254-0003" context="ifd[class=image]" level="error">
<title>NewSubfileType valid value</title>
<description>The value of the NewSubfileType tag must be between 0 and 7</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=NewSubfileType] > -1} && {tags.tag[name=NewSubfileType] < 8}">NewSubfileType value is not valid,the value should be between 0 and 7 </assert>
</rule>
<rule id="TAG-254-0004" context="ifd[type=Transparency]" level="error">
<title>NewSubfileType match with the image type</title>
<description>NewSubfileType defines a transparency mask for another image in this TIFF file.
The PhotometricInterpretation value must be 4</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{!tags.tag[name=NewSubfileType]} || {tags.tag[name=NewSubfileType] > 3}">NewSubfileType defines a transparency mask while PhotometricInterpretation defines another image type</assert>
</rule>
<rule id="TAG-254-0005" context="ifd[class=image]" level="warning" experimental="true">
<title>NewSubfileType not defined in a multi page TIFF</title>
<description>NewSubfileType is not defined as a multipage in and IFD containg the PageNumber tag.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=PageNumber]} && {!tags.tag[name=NewSubfileType} || {tags.tag[name=NewSubfileType] != 2} && {tags.tag[name=NewSubfileType] != 3} && {tags.tag[name=NewSubfileType] != 6} && {tags.tag[name=NewSubfileType] != 7}">NewSubfileType is not defined as a multipage in and IFD containg the PageNumber tag</assert>
</rule>
<rule id="TAG-254-0006" context="ifd[class=image]" level="warning">
<title>NewSubfileType define a multipage TIFF without PageNumber</title>
<description>NewSubfileType defines a multi page TIFF. each image in the file should have the PageNumber Tag.
The PhotometricInterpretation value must be 4</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{!tags.tag[name=PageNumber]} && {tags.tag[name=NewSubfileType] == 2} || {tags.tag[name=NewSubfileType] == 3} || {tags.tag[name=NewSubfileType] == 6} || {tags.tag[name=NewSubfileType] == 7}">NewSubfileType defines a multi page TIFF. each image in the file should have the PageNumber Tag.</assert>
</rule>
<rule id="TAG-254-0007" context="ifd[class=image]" level="error">
<title>NewSubfileType with SubfileType</title>
<description>NewSubfileType replace the old SubfileType. When NewSubfileType is defined SubfileType should not be used</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{!tags.tag[name=NewSubfileType]} || {!tags.tag[name=SubfileType]}">When NewSubfileType is defined SubfileType should not be used.</assert>
</rule>
<rule id="TAG-254-0008" context="ifd" level="warning">
<title>NewSubfileType requires and image ifd</title>
<description>NewSubfileType should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=NewSubfileType]} && {class != 'image'}">NewSubfileType should only be used in an image IFD</assert>
</rule>
<rule id="TAG-254-0009" context="ifd[class=image]" level="info">
<title>NewSubfileType default value</title>
<description>NewSubfileType tag has a default value, if it is not present a full resolution, single image, no transparency is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{!tags.tag[name=NewSubfileType]}">NewSubfileType Tag is not defined. Then a full resolution, single image, no transparency is assumed</assert>
</rule>
</rules>
<rules id="TAG-274">
<title>Orientation</title>
<description>The orientation of the image with respect to the rows and columns.
Tag = 274 (112.H)
Type = SHORT
N = 1
Default is 1.
1 = The 0th row represents the visual top of the image, and the 0th column represents the visual left-hand side.
2 = The 0th row represents the visual top of the image, and the 0th column represents the visual right-hand side.
3 = The 0th row represents the visual bottom of the image, and the 0th column represents the visual right-hand side.
4 = The 0th row represents the visual bottom of the image, and the 0th column represents the visual left-hand side.
5 = The 0th row represents the visual left-hand side of the image, and the 0th column represents the visual top.
6 = The 0th row represents the visual right-hand side of the image, and the 0th column represents the visual top.
7 = The 0th row represents the visual right-hand side of the image, and the 0th column represents the visual bottom.
8 = The 0th row represents the visual left-hand side of the image, and the 0th column represents the visual bottom.
Support for orientations other than 1 is not a Baseline TIFF requirement.</description>
<rule id="TAG-274-0001" context="tag[id=274]" level="error">
<title>Orientation tag valid Type</title>
<description>Orientation Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{type=='SHORT'}">Orientation Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-274-0002" context="tag[id=274]" level="error">
<title>Orientation valid cardinality</title>
<description>The cardinality of the Orientation tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{cardinality==1}">Orientation cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-274-0003" context="ifd[class=image]" level="error">
<title>Orientation tag valid value</title>
<description>Orientation valid values are between 1 and 8.
1 = The 0th row represents the visual top of the image, and the 0th column represents the visual left-hand side.
2 = The 0th row represents the visual top of the image, and the 0th column representsthe visual right-hand side.
3 = The 0th row represents the visual bottom of the image, and the 0th column representsthe visual right-hand side.
4 = The 0th row represents the visual bottom of the image, and the 0th column representsthe visual left-hand side.
5 = The 0th row represents the visual left-hand side of the image, and the 0th columnrepresents the visual top.
6 = The 0th row represents the visual right-hand side of the image, and the 0th column represents the visual top.
7 = The 0th row represents the visual right-hand side of the image, and the 0th columnrepresents the visual bottom.
8 = The 0th row represents the visual left-hand side of the image, and the 0th columnrepresents the visual bottom.
Default is 1.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=Orientation] > 0} && {tags.tag[name=Orientation] < 9}">Orientation value is not valid, possible values are between 1 and 8</assert>
</rule>
<rule id="TAG-274-0004" context="ifd[class=image]" level="warning">
<title>Orientation other than 1</title>
<description>Support for orientations other than 1 is not a Baseline TIFF requirement.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=Orientation] != 1}">Support for orientations other than 1 is not a Baseline TIFF requirement.</assert>
</rule>
<rule id="TAG-274-0005" context="ifd" level="warning">
<title>Orientation requires and image ifd</title>
<description>Orientation should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=Orientation] && {class != 'image'}">Orientation should only be used in an image IFD</assert>
</rule>
<rule id="TAG-274-0006" context="ifd[class=image]" level="info">
<title>Orientation default value</title>
<description>Orientation tag has a default value, if it is not present the 0th row represents the visual top of the image, and the 0th column represents the visual left-hand side.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{!tags.tag[name=Orientation]}">Orientation Tag is not defined. Then 0th row represents the visual top of the image, and the 0th column represents the visual left-hand side</assert>
</rule>
</rules>
<rules id="TAG-262">
<title>PhotometricInterpretation</title>
<description>The color space of the image data.
Tag = 262 (106.H)
Type = SHORT
N = 1
No default
Currently defined values are:
0 = WhiteIsZero. For bilevel and grayscale images: 0 is imaged as white. 2**BitsPerSample-1 is imaged as black.
1 = BlackIsZero. For bilevel and grayscale images: 0 is imaged as black. 2**BitsPerSample-1 is imaged as white.
2 = RGB. In the RGB model, a color is described as a combination of the three primary colors of light (red, green, and blue) in particular concentrations.
3 = Palette color.
4 = Transparency Mask.
There is no default for PhotometricInterpretation, and it is required. Do not rely
on applications defaulting to what you want.</description>
<rule id="TAG-262-0001" context="tag[id=262]" level="error">
<title>PhotometricInterpretation tag valid Type</title>
<description>PhotometricInterpretation Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{type=='SHORT'}">PhotometricInterpretation Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-262-0002" context="tag[id=262]" level="error">
<title>PhotometricInterpretation valid cardinality</title>
<description>The cardinality of the PhotometricInterpretation tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{cardinality==1}">PhotometricInterpretation cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-262-0003" context="ifd" level="error">
<title>Valid Photometric Interpretation value</title>
<description>The Photometric Interpretation tag must have a valid value.
0 = WhiteIsZero. For bilevel and grayscale images: 0 is imaged as white.
1 = BlackIsZero. For bilevel and grayscale images: 0 is imaged as black.
2 = RGB. RGB value of (0,0,0) represents black, and (255,255,255) represents white, assuming 8-bit components. The components are stored in the indicated order: first Red, then Green, then Blue.
3 = Palette color. In this model, a color is described with a single component. The value of the component is used as an index into the red, green and blue curves in the ColorMap field to retrieve an RGB triplet that defines the color. When PhotometricInterpretation=3 is used, ColorMap must be present and SamplesPerPixel must be 1.
4 = Transparency Mask. This means that the image is used to define an irregularly shaped region of another image in the same TIFF file. SamplesPerPixel and BitsPerSample must be 1. PackBits compression is recommended. The 1-bits define the interior of the region; the 0-bits define the exterior of the region.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>37</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation] > -1} && {tags.tag[name=PhotometricInterpretation] < 5}">Photometric Interpretation value must be between 0 and 4</assert>
</rule>
<rule id="TAG-262-0004" context="ifd" level="warning">
<title>PhotometricInterpretation requires and image ifd</title>
<description>PhotometricInterpretation should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=PhotometricInterpretation]} && {class != 'image'}">PhotometricInterpretation should only be used in an image IFD</assert>
</rule>
</rules>
<rules id="TAG-284">
<title>PlanarConfiguration</title>
<description>How the components of each pixel are stored.
Tag = 284 (11C.H)
Type = SHORT
N = 1
Default is 1
Currently defined values are:
1 = Chunky format. The component values for each pixel are stored contiguously.
2 = Planar format. The components are stored in separate “component planes.”
PlanarConfiguration=2 is not currently in widespread use and it is not recommended for general interchange. It is used as an extension and Baseline TIFF readers are not required to support it.
If SamplesPerPixel is 1, PlanarConfiguration is irrelevant, and need not be included.</description>
<rule id="TAG-284-0001" context="tag[id=284]" level="error">
<title>PlanarConfiguration tag valid Type</title>
<description>PlanarConfiguration Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{type=='SHORT'}">PlanarConfiguration Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-284-0002" context="tag[id=284]" level="error">
<title>PlanarConfiguration valid cardinality</title>
<description>The cardinality of the PlanarConfiguration tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{cardinality==1}">PlanarConfiguration cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-284-0003" context="ifd[class=image]" level="error">
<title>PlanarConfiguration valid values</title>
<description>The values of the PlanarConfiguration tag must be 1(Chunky) or 2(Planar)</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration] > 0} && {tags.tag[name=PlanarConfiguration] < 3}">PlanarConfiguration value is not valid, valeu should be ust be 1(Chunky) or 2(Planar)</assert>
</rule>
<rule id="TAG-284-0004" context="ifd[class=image]" level="warning">
<title>PlanarConfiguration Planar</title>
<description>PlanarConfiguration in Planar format is not currently in widespread use and it is not recommended
for general interchange. It is used as an extension and Baseline TIFF
readers are not required to support it.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration] == 2}">PlanarConfiguration in Planar format is not currently in widespread use and it is not recommended
for general interchange. It is used as an extension and Baseline TIFF
readers are not required to support it.</assert>
</rule>
<rule id="TAG-284-0005" context="ifd" level="warning">
<title>PlanarConfiguration requires more than one SamplesPerPixel</title>
<description>If SamplesPerPixel is 1, PlanarConfiguration is irrelevant, and need not be included.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration]} && {tags.tag[name=SamplesPerPixel] == 1}">PlanarConfiguration is irrelevant if SamplesPerPixel is 1, and need not be included.</assert>
</rule>
<rule id="TAG-284-0006" context="ifd" level="warning">
<title>PlanarConfiguration requires and image ifd</title>
<description>PlanarConfiguration should only be used in an image IFD.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>36</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration]} && {class != 'image'}">PlanarConfiguration should only be used in an image IFD</assert>
</rule>
<rule id="TAG-284-0007" context="ifd[class=image]" level="info">
<title>PlanarConfiguration default value</title>
<description>PlanarConfiguration tag has a default value, if it is not present Chunky format is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{!tags.tag[name=PlanarConfiguration]}">PlanarConfiguration Tag is not defined. Then the default unit (Chunky format) it is assumed</assert>
</rule>
</rules>
<rules id="TAG-296">
<title>ResolutionUnit</title>
<description>The unit of measurement for XResolution and YResolution.
Tag = 296 (128.H)
Type = SHORT
N = 1
Default is 2.
Currently defined values are:
1 = No absolute unit of measurement. Used for images that may have a non-square aspect ratio, but no meaningful absolute dimensions.
2 = Inch.
3 = Centimeter.</description>
<rule id="TAG-296-0001" context="tag[id=296]" level="error">
<title>ResolutionUnit tag valid Type</title>
<description>ResolutionUnit Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{type=='SHORT'}">ResolutionUnit Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-296-0002" context="tag[id=296]" level="error">
<title>ResolutionUnit valid cardinality</title>
<description>The cardinality of the ResolutionUnit tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{cardinality==1}">ResolutionUnit cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-296-0003" context="ifd[class=image]" level="error">
<title>ResolutionUnit valid values</title>
<description>The values of the ResolutionUnit tag are:
1 = No absolute unit of measurement.
2 = Inch.
3 = Centimeter</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=ResolutionUnit] > 0} && {tags.tag[name=ResolutionUnit] < 4}">ResolutionUnit value is not valid, value should be between 1 and 3</assert>
</rule>
<rule id="TAG-296-0004" context="ifd" level="warning">
<title>ResolutionUnit requires and image ifd</title>
<description>ResolutionUnit should only be used in an image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=ResolutionUnit]} && {class != 'image'}">ResolutionUnit should only be used in an image IFD</assert>
</rule>
<rule id="TAG-296-0005" context="ifd[class=image]" level="info">
<title>ResolutionUnit without absolute units</title>
<description>The drawback of ResolutionUnit without absolute units is that different applications will import the image
at different sizes. Even if the decision is arbitrary, it might be better to use dots per
inch or dots per centimeter, and to pick XResolution and YResolution so that the
aspect ratio is correct with and arbitrary image maximum dimension</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>38</page></reference>
<assert test="{tags.tag[name=ResolutionUnit] == 1}">ResolutionUnit without absolute units, different applications will import the image at different sizes</assert>
</rule>
<rule id="TAG-296-0006" context="ifd[class=image]" level="info">
<title>ResolutionUnit default value</title>
<description>ResolutionUnit tag has a default value, if it is not present inch unit is assumed.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{!tags.tag[name=ResolutionUnit]}">ResolutionUnit Tag is not defined. Then the default unit (Inch) it is assumed</assert>
</rule>
</rules>
<rules id="TAG-278">
<title>RowsPerStrip</title>
<description>The number of rows per strip
Tag = 278 (116.H)
Type = SHORT or LONG
N = 1
The default is 2**32 - 1,which is effectively infinity. That is, the entire image is
one strip.</description>
<rule id="TAG-278-0001" context="tag[id=278]" level="error">
<title>RowsPerStrip tag valid Type</title>
<description>ResolutionUnit Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{type=='SHORT'} || {type=='LONG'}">RowsPerStrip Tag type is not valid, a SHORT or LONG type is expected</assert>
</rule>
<rule id="TAG-278-0002" context="tag[id=278]" level="error">
<title>RowsPerStrip valid cardinality</title>
<description>The cardinality of the RowsPerStrip tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{cardinality==1}">RowsPerStrip cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-278-0003" context="ifd[class=image]" level="warning">
<title>RowsPerStrip should only be in an image IFD</title>
<description>RowsPerStrip tag should only be used in a Baseline Image IFD</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{tags.tag[name=RowsPerStrip]} && {strips != 1}">RowsPerStrip is required in an image IFD</assert>
</rule>
<rule id="TAG-278-0004" context="ifd[strips=1]" level="info">
<title>RowsPerStrip default value</title>
<description>When RowsPerStrip is not defined in a strip image IFD then the default value 2**32 - 1 is assumed</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{!tags.tag[name=RowsPerStrip]} && {strips == 1}">RowsPerStrip not defined, default value 2**32 - 1 is assumed</assert>
</rule>
</rules>
<rules id="TAG-277">
<title>SamplesPerPixel</title>
<description>The number of components per pixel.
Tag = 277 (115.H)
Type = SHORT
N = 1
Default = 1
SamplesPerPixel is usually 1 for bilevel, grayscale, and palette-color images.
SamplesPerPixel is usually 3 for RGB images.</description>
<rule id="TAG-277-0001" context="tag[id=277]" level="error">
<title>SamplesPerPixel tag valid Type</title>
<description>SamplesPerPixel Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{type=='SHORT'}">SamplesPerPixel Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-277-0002" context="tag[id=277]" level="error">
<title>SamplesPerPixel valid cardinality</title>
<description>The cardinality of the SamplesPerPixel tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{cardinality==1}">SamplesPerPixel cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-277-0003" context="ifd[class=image]" level="info">
<title>SamplesPerPixel default value</title>
<description>SamplesPerPixel tag has a default value, if it is not present in and image IFD then one SamplesPerPixel is assumed.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{!tags.tag[name=SamplesPerPixel]}">SamplesPerPixel Tag is not defined. Then the default value (one SamplesPerPixel) it is assumed</assert>
</rule>
</rules>
<rules id="TAG-305">
<title>Software</title>
<description>Name and version number of the software package(s) used to create the image.
Tag = 305 (131.H)
Type = ASCII
No default.</description>
<rule id="TAG-305-0001" context="tag[id=305]" level="error">
<title>Software tag valid Type</title>
<description>Software Tag type must be ASCII</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>39</page></reference>
<assert test="{type=='ASCII'}">Software Tag type is not valid, an ASCII type is expected</assert>
</rule>
</rules>
<rules id="TAG-279">
<title>StripByteCounts</title>
<description>For each strip, the number of bytes in the strip after compression.
Tag = 279 (117.H)
Type = SHORT or LONG
N = StripsPerImage for PlanarConfiguration equal to 1 or SamplesPerPixel * StripsPerImage for PlanarConfiguration equal to 2
No default.
This tag is required for Baseline TIFF files.</description>
<rule id="TAG-279-0001" context="tag[id=279]" level="error">
<title>StripByteCounts tag valid Type</title>
<description>StripByteCounts Tag type must be SHORT or LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{type=='LONG'} || {type=='SHORT'}">StripByteCounts Tag type is not valid, a SHORT or LONG type is expected</assert>
</rule>
<rule id="TAG-279-0003" context="ifd[class=image]" level="error" experimental="true">
<title>StripByteCounts valid cardinality</title>
<description>StripByteCounts tag cardinality is equal StripsPerImage for PlanarConfiguration equal to 1, and
SamplesPerPixel * StripsPerImage for PlanarConfiguration equal to 2</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration] == 1} && {tags.tag[name=StripBYTECount].cardinality == StripsPerImage} || {tags.tag[name=PlanarConfiguration] == 2} && {tags.tag[name=StripBYTECount].cardinality == tags.tag[name=SamplesPerPixel] * StripsPerImage}">StripByteCounts invalid cardinality</assert>
</rule>
</rules>
<rules id="TAG-273">
<title>StripOffsets</title>
<description>For each strip, the byte offset of that strip.
Tag = 273 (111.H)
Type = SHORT or LONG
N = StripsPerImage for PlanarConfiguration equal to 1 or SamplesPerPixel * StripsPerImage for PlanarConfiguration equal to 2
No default.
The offset is specified with respect to the beginning of the TIFF file. Note that this implies that each strip has a location independent of the locations of other strips.
This feature may be useful for editing applications. This required field is the only way for a reader to find the image data.
Note that either SHORT or LONG values may be used to specify the strip offsets.
SHORT values may be used for small TIFF files. It should be noted, however, that earlier TIFF specifications required LONG strip offsets and that some software may not accept SHORT values.
For maximum compatibility with operating systems such as MS-DOS and Windows, the StripOffsets array should be less than or equal to 64K bytes in length, and the strips themselves, in both compressed and uncompressed forms, should
not be larger than 64K bytes.
No default.</description>
<rule id="TAG-273-0001" context="tag[id=279]" level="error">
<title>StripOffsets tag valid Type</title>
<description>StripOffsets Tag type must be SHORT OR LONG</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{type=='LONG'} || {type=='SHORT'}">StripOffsets Tag type is not valid, a SHORT or LONG type is expected</assert>
</rule>
<rule id="TAG-273-0005" context="tag[id=279]" level="warning">
<title>StripOffsets type SHORT</title>
<description>
Note that either SHORT or LONG values may be used to specify the strip offsets.
It should be noted, however, that earlier TIFF specifications required LONG strip offsets and that some software may not accept SHORT values.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{type=='SHORT'}">StripOffsets Tag type is valid. However, earlier TIFF specifications required LONG strip offsets and that some software may not accept SHORT values</assert>
</rule>
<rule id="TAG-273-0003" context="ifd[strips=1]" level="error" experimental="true">
<title>StripOffsets valid cardinality</title>
<description>StripOffsets tag cardinality is equal StripsPerImage for PlanarConfiguration equal to 1, and
SamplesPerPixel * StripsPerImage for PlanarConfiguration equal to 2</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="{tags.tag[name=PlanarConfiguration] == 1} && {tags.tag[name=StripOffsets].cardinality == StripsPerImage} || {tags.tag[name=PlanarConfiguration] == 2} && {tags.tag[name=StripOffsets].cardinality == tags.tag[name=SamplesPerPixel] * StripsPerImage}">StripOffsets invalid cardinality</assert>
</rule>
<rule id="TAG-273-0004" context="ifd[type=Strip]" level="warning" experimental="true">
<title>StripOffsets Dos and Windows compatibility</title>
<description>
For maximum compatibility with operating systems such as MS-DOS and Windows,
the StripOffsets array should be less than or equal to 64K bytes in length,
and the strips themselves, in both compressed and uncompressed forms, should
not be larger than 64K bytes.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>40</page></reference>
<assert test="({tags.tag[name=StripOffsets].size < 65537} && {strips.size < 65537}">StripByteCounts invalid cardinality</assert>
</rule>
</rules>
<rules id="TAG-255">
<title>SubfileType</title>
<description>A general indication of the kind of data contained in this subfile.
Tag = 255 (FF.H)
Type = SHORT
N = 1
No default
Currently defined values are:
1 = full-resolution image data
2 = reduced-resolution image data
3 = a single page of a multi-page image (see the PageNumber field description).
Note that several image types may be found in a single TIFF file, with each subfile described by its own IFD.
This field is deprecated. The NewSubfileType field should be used instead.</description>
<rule id="TAG-255-0001" context="tag[id=255]" level="error">
<title>SubfileType tag valid Type</title>
<description>SubfileType Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>40-41</pages></reference>
<assert test="{type=='SHORT'}">SubfileType Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-255-0002" context="tag[id=255]" level="error">
<title>SubfileType valid cardinality</title>
<description>The cardinality of the SubfileType tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>40-41</pages></reference>
<assert test="{cardinality==1}">SubfileType cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-255-0003" context="ifd" level="error">
<title>SubfileType valid values</title>
<description>Currently defined values are:
1 = full-resolution image data
2 = reduced-resolution image data
3 = a single page of a multi-page image (see the PageNumber field description).</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>40-41</pages></reference>
<assert test="{tags.tag[name=SubfileType] > 0} && {tags.tag[name=SubfileType] < 4}">SubfileType Tag value is not valid, a value between 1 and 3 is expected</assert>
</rule>
<rule id="TAG-255-0004" context="ifd" level="warning">
<title>SubfileType is deprecated</title>
<description>This field is deprecated. The NewSubfileType field should be used instead</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><pages>40-41</pages></reference>
<assert test="{tags.tag[name=SubfileType]}">This field is deprecated. The NewSubfileType field should be used instead</assert>
</rule>
</rules>
<rules id="TAG-263">
<title>Threshholding</title>
<description>For black and white TIFF files that represent shades of gray, the technique used to
convert from gray to black and white pixels.
Tag = 263 (107.H)
Type = SHORT
N = 1
Default is 1
Currently defined values are:
1 = No dithering or halftoning has been applied to the image data.
2 = An ordered dither or halftone technique has been applied to the image data.
3 = A randomized process such as error diffusion has been applied to the image data.</description>
<rule id="TAG-263-0001" context="tag[id=263]" level="error">
<title>Threshholding tag valid Type</title>
<description>Threshholding Tag type must be SHORT</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{type=='SHORT'}">Threshholding Tag type is not valid, a SHORT type is expected</assert>
</rule>
<rule id="TAG-263-0002" context="tag[id=263]" level="error">
<title>Threshholding valid cardinality</title>
<description>The cardinality of the Threshholding tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{cardinality==1}">Threshholding cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-263-0003" context="ifd" level="error">
<title>Threshholding valid values</title>
<description>Currently defined values are:
1 = No dithering or halftoning has been applied to the image data.
2 = An ordered dither or halftone technique has been applied to the image data.
3 = A randomized process such as error diffusion has been applied to the image data.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=Threshholding] > 0} && {tags.tag[name=Threshholding] < 4}">Threshholding Tag value is not valid, a value between 1 and 3 is expected</assert>
</rule>
<rule id="TAG-263-0004" context="ifd" level="warning">
<title>Threshholding only valid in Grayscale images</title>
<description>Threshholding tag is only for black and white TIFF files that represent shades of gray.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=Threshholding]} && {type != 'Grayscale'}">Threshholding Tag is only valid in an IDF contaning a Grayscale images</assert>
</rule>
<rule id="TAG-263-0005" context="ifd[type=Grayscale]" level="info">
<title>Threshholding default value</title>
<description>Threshholding tag has a default value, if it is not present in black and white TIFF files that represent shades of gray then No dithering or halftoning has been applied to the image data is assumed.
</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{!tags.tag[name=Threshholding]}">Threshholding Tag is not defined. Then the default value (No dithering or halftoning has been applied to the image data) it is assumed</assert>
</rule>
</rules>
<rules id="TAG-282">
<title>XResolution</title>
<description>The number of pixels per ResolutionUnit in the ImageWidth direction.
Tag = 282 (11A.H)
Type = RATIONAL
N = 1
No default
It is not mandatory that the image be actually displayed or printed at the size implied by this parameter. It is up to the application to use this information as it wishes.</description>
<rule id="TAG-282-0001" context="tag[id=282]" level="error">
<title>XResolution tag valid Type</title>
<description>XResolution Tag type must be RATIONAL</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{type=='RATIONAL'}">XResolution Tag type is not valid, a RATIONAL type is expected</assert>
</rule>
<rule id="TAG-282-0002" context="tag[id=282]" level="error">
<title>XResolution valid cardinality</title>
<description>The cardinality of the XResolution tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{cardinality==1}">XResolution cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-282-0003" context="ifd" level="warning">
<title>XResolution only in an Image IFD</title>
<description>XResolution tag should only be used in a IFD defining and image.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=XResolution]} && {class != 'image'}"> XResolution tag should only be used in a IFD defining and image.</assert>
</rule>
<rule id="TAG-282-0004" context="ifd[class=image]" level="info">
<title>XResolution use in applications</title>
<description>It is not mandatory that the image be actually displayed or printed at the size implied
by this parameter. It is up to the application to use this information as it wishes.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=XResolution]}"> It is not mandatory that the image be actually displayed or printed at the size implied
by XResolution. It is up to the application to use this information as it wishes.</assert>
</rule>
<rule id="TAG-282-0005" context="ifd" level="warning">
<title>XResolution value is zero</title>
<description>XResolution tag should be greater than zero.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=XResolution] == 0} && {tags.tag[name=ResolutionUnit] != 1} || {!tags.tag[name=ResolutionUnit]}"> XResolution tag must be greater than zero.</assert>
</rule>
</rules>
<rules id="TAG-283">
<title>YResolution</title>
<description>The number of pixels per ResolutionUnit in the ImageLength direction.
Tag = 283 (11B.H)
Type = RATIONAL
N = 1
No default
It is not mandatory that the image be actually displayed or printed at the size implied by this parameter. It is up to the application to use this information as it wishes.</description>
<rule id="TAG-283-0001" context="tag[id=283]" level="error">
<title>YResolution tag valid Type</title>
<description>YResolution Tag type must be RATIONAL</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{type=='RATIONAL'}">YResolution Tag type is not valid, a RATIONAL type is expected</assert>
</rule>
<rule id="TAG-283-0002" context="tag[id=283]" level="error">
<title>YResolution valid cardinality</title>
<description>The cardinality of the YResolution tag must be 1</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{cardinality==1}">YResolution cardinality is not valid, cardinality should be 1</assert>
</rule>
<rule id="TAG-283-0003" context="ifd" level="warning">
<title>YResolution only in an Image IFD</title>
<description>YResolution tag should only be used in a IFD defining and image.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=YResolution]} && {class != 'image'}">YResolution tag should only be used in a IFD defining and image.</assert>
</rule>
<rule id="TAG-283-0004" context="ifd[class=image]" level="info">
<title>YResolution use in applications</title>
<description>It is not mandatory that the image be actually displayed or printed at the size implied
by this parameter. It is up to the application to use this information as it wishes.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=YResolution]}">It is not mandatory that the image be actually displayed or printed at the size implied
by YResolution. It is up to the application to use this information as it wishes.</assert>
</rule>
<rule id="TAG-283-0005" context="ifd" level="warning">
<title>YResolution value is zero</title>
<description>YResolution tag should be greater than zero.</description>
<reference><document>TIFF Baseline 6</document><section>Section 8: Baseline Field Reference Guide</section><page>41</page></reference>
<assert test="{tags.tag[name=YResolution] == 0} && {tags.tag[name=ResolutionUnit] != 1} || {!tags.tag[name=ResolutionUnit]}"> YResolution tag must be greater than zero.</assert>
</rule>
</rules>
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