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/*
* Copyright (c) 2011, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.imageio.color;
import java.awt.color.ColorSpace;
/**
* A fallback CMYK ColorSpace, in case none can be read from disk.
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: CMYKColorSpace.java,v 1.0 Apr 30, 2008 1:38:13 PM haraldk Exp$
*/
final class CMYKColorSpace extends ColorSpace {
static final ColorSpace INSTANCE = new CMYKColorSpace();
final ColorSpace sRGB = getInstance(CS_sRGB);
private CMYKColorSpace() {
super(ColorSpace.TYPE_CMYK, 4);
}
public static ColorSpace getInstance() {
return INSTANCE;
}
public float[] toRGB(float[] colorvalue) {
return new float[] {
(1 - colorvalue[0]) * (1 - colorvalue[3]),
(1 - colorvalue[1]) * (1 - colorvalue[3]),
(1 - colorvalue[2]) * (1 - colorvalue[3])
};
// TODO: Convert via CIEXYZ space using sRGB space, as suggested in docs
// return sRGB.fromCIEXYZ(toCIEXYZ(colorvalue));
}
public float[] fromRGB(float[] rgbvalue) {
// Compute CMY
float c = 1 - rgbvalue[0];
float m = 1 - rgbvalue[1];
float y = 1 - rgbvalue[2];
// Find K
float k = Math.min(c, Math.min(m, y));
// Convert to CMYK values
return new float[] {(c - k), (m - k), (y - k), k};
/*
http://www.velocityreviews.com/forums/t127265-rgb-to-cmyk.html
(Step 0: Normalize R,G, and B values to fit into range [0.0 ... 1.0], or
adapt the following matrix.)
Step 1: RGB to CMY
| C | | 1 | | R |
| M | = | 1 | - | G |
| Y | | 1 | | B |
Step 2: CMY to CMYK
| C' | | C | | min(C,M,Y) |
| M' | | M | | min(C,M,Y) |
| Y' | = | Y | - | min(C,M,Y) |
| K' | | min(C,M,Y) | | 0 |
Easier to calculate if K' is calculated first, because K' = min(C,M,Y):
| C' | | C | | K' |
| M' | | M | | K' |
| Y' | = | Y | - | K' |
| K' | | K'| | 0 |
*/
// return fromCIEXYZ(sRGB.toCIEXYZ(rgbvalue));
}
public float[] toCIEXYZ(float[] colorvalue) {
return sRGB.toCIEXYZ(toRGB(colorvalue));
}
public float[] fromCIEXYZ(float[] colorvalue) {
return sRGB.fromCIEXYZ(fromRGB(colorvalue));
}
}
