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iText, a free Java-PDF library
/*
* $Id: 5d5c377d040f381f8fca2c1f036bbcb9e8190b12 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
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* Boston, MA, 02110-1301 USA, or download the license from the following URL:
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* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
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* These activities include: offering paid services to customers as an ASP,
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* For more information, please contact iText Software Corp. at this
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*/
package com.itextpdf.text.pdf;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.error_messages.MessageLocalization;
import java.util.Arrays;
public class PdfLabColor implements ICachedColorSpace {
float[] whitePoint = new float[]{0.9505f, 1.0f, 1.0890f};
float[] blackPoint = null;
float[] range = null;
public PdfLabColor() {}
public PdfLabColor(float[] whitePoint) {
if (whitePoint == null
|| whitePoint.length != 3
|| whitePoint[0] < 0.000001f || whitePoint[2] < 0.000001f
|| whitePoint[1] < 0.999999f || whitePoint[1] > 1.000001f)
throw new RuntimeException(MessageLocalization.getComposedMessage("lab.cs.white.point"));
this.whitePoint = whitePoint;
}
public PdfLabColor(float[] whitePoint, float[] blackPoint) {
this(whitePoint);
this.blackPoint = blackPoint;
}
public PdfLabColor(float[] whitePoint, float[] blackPoint, float[] range) {
this(whitePoint, blackPoint);
this.range = range;
}
public PdfObject getPdfObject(PdfWriter writer) {
PdfArray array = new PdfArray(PdfName.LAB);
PdfDictionary dictionary = new PdfDictionary();
if (whitePoint == null
|| whitePoint.length != 3
|| whitePoint[0] < 0.000001f || whitePoint[2] < 0.000001f
|| whitePoint[1] < 0.999999f || whitePoint[1] > 1.000001f)
throw new RuntimeException(MessageLocalization.getComposedMessage("lab.cs.white.point"));
dictionary.put(PdfName.WHITEPOINT, new PdfArray(whitePoint));
if (blackPoint != null) {
if (blackPoint.length != 3
|| blackPoint[0] < -0.000001f || blackPoint[1] < -0.000001f || blackPoint[2] < -0.000001f)
throw new RuntimeException(MessageLocalization.getComposedMessage("lab.cs.black.point"));
dictionary.put(PdfName.BLACKPOINT, new PdfArray(blackPoint));
}
if (range != null) {
if (range.length != 4 || range[0] > range[1] || range[2] > range[3])
throw new RuntimeException(MessageLocalization.getComposedMessage("lab.cs.range"));
dictionary.put(PdfName.RANGE, new PdfArray(range));
}
array.add(dictionary);
return array;
}
public BaseColor lab2Rgb(float l, float a, float b) {
double[] clinear = lab2RgbLinear(l, a, b);
return new BaseColor((float)clinear[0], (float)clinear[1], (float)clinear[2]);
}
CMYKColor lab2Cmyk(float l, float a, float b) {
double[] clinear = lab2RgbLinear(l, a, b);
double r = clinear[0];
double g = clinear[1];
double bee = clinear[2];
double computedC = 0, computedM = 0, computedY = 0, computedK = 0;
// BLACK
if (r==0 && g==0 && b==0) {
computedK = 1;
} else {
computedC = 1 - r;
computedM = 1 - g;
computedY = 1 - bee;
double minCMY = Math.min(computedC,
Math.min(computedM,computedY));
computedC = (computedC - minCMY) / (1 - minCMY) ;
computedM = (computedM - minCMY) / (1 - minCMY) ;
computedY = (computedY - minCMY) / (1 - minCMY) ;
computedK = minCMY;
}
return new CMYKColor((float)computedC, (float)computedM, (float)computedY, (float)computedK);
}
protected double[] lab2RgbLinear(float l, float a, float b) {
if (range != null && range.length == 4) {
if (a < range[0])
a = range[0];
if (a > range[1])
a = range[1];
if (b < range[2])
b = range[2];
if (b > range[3])
b = range[3];
}
double theta = 6.0 / 29.0;
double fy = (l + 16) / 116.0;
double fx = fy + (a / 500.0);
double fz = fy - (b / 200.0);
double x = fx > theta ? whitePoint[0] * (fx * fx * fx) : (fx - 16.0/116.0) * 3 * (theta * theta) * whitePoint[0];
double y = fy > theta ? whitePoint[1] * (fy * fy * fy) : (fy - 16.0/116.0) * 3 * (theta * theta) * whitePoint[1];
double z = fz > theta ? whitePoint[2] * (fz * fz * fz) : (fz - 16.0/116.0) * 3 * (theta * theta) * whitePoint[2];
double[] clinear = new double[3];
clinear[0] = x * 3.2410 - y * 1.5374 - z * 0.4986; // red
clinear[1] = -x * 0.9692 + y * 1.8760 - z * 0.0416; // green
clinear[2] = x * 0.0556 - y * 0.2040 + z * 1.0570; // blue
for (int i = 0; i < 3; i++) {
clinear[i] = (clinear[i] <= 0.0031308)
? 12.92 * clinear[i]
: (1 + 0.055) * Math.pow(clinear[i], (1.0/2.4)) - 0.055;
if (clinear[i] < 0)
clinear[i] = 0;
else if (clinear[i] > 1f)
clinear[i] = 1.0;
}
return clinear;
}
public LabColor rgb2lab(BaseColor baseColor) {
double rLinear = baseColor.getRed() / 255f;
double gLinear = baseColor.getGreen() / 255f;
double bLinear = baseColor.getBlue() / 255f;
// convert to a sRGB form
double r = (rLinear > 0.04045) ? Math.pow((rLinear + 0.055) / (1 + 0.055), 2.2) : (rLinear/12.92);
double g = (gLinear > 0.04045) ? Math.pow((gLinear + 0.055) / (1 + 0.055), 2.2) : (gLinear/12.92);
double b = (bLinear > 0.04045) ? Math.pow((bLinear + 0.055) / (1 + 0.055), 2.2) : (bLinear/12.92);
// converts
double x = r * 0.4124 + g * 0.3576 + b * 0.1805;
double y = r * 0.2126 + g * 0.7152 + b * 0.0722;
double z = r * 0.0193 + g * 0.1192 + b * 0.9505;
float l = Math.round((116.0 * fXyz(y/whitePoint[1]) - 16) * 1000) / 1000f;
float a = Math.round((500.0*(fXyz(x/whitePoint[0]) - fXyz(y/whitePoint[1]))) * 1000) / 1000f;
float bee = Math.round((200.0*(fXyz(y/whitePoint[1]) - fXyz(z/whitePoint[2]))) * 1000) / 1000f;
return new LabColor(this, l, a, bee);
}
private static double fXyz(double t) {
return ((t > 0.008856) ? Math.pow(t, (1.0/3.0)) : (7.787*t + 16.0/116.0));
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof PdfLabColor)) return false;
PdfLabColor that = (PdfLabColor) o;
if (!Arrays.equals(blackPoint, that.blackPoint)) return false;
if (!Arrays.equals(range, that.range)) return false;
if (!Arrays.equals(whitePoint, that.whitePoint)) return false;
return true;
}
@Override
public int hashCode() {
int result = Arrays.hashCode(whitePoint);
result = 31 * result + (blackPoint != null ? Arrays.hashCode(blackPoint) : 0);
result = 31 * result + (range != null ? Arrays.hashCode(range) : 0);
return result;
}
}