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package com.sun.imageio.plugins.common;

import java.awt.color.ColorSpace;

Singleton class representing a simple, mathematically defined CMYK color space.
/** * Singleton class representing a simple, mathematically defined CMYK * color space. */
public final class SimpleCMYKColorSpace extends ColorSpace { private static final long serialVersionUID = 5387117338644522424L; private static ColorSpace theInstance = null; private ColorSpace csRGB;
The exponent for gamma correction.
/** The exponent for gamma correction. */
private static final double power1 = 1.0 / 2.4; public static final synchronized ColorSpace getInstance() { if(theInstance == null) { theInstance = new SimpleCMYKColorSpace(); } return theInstance; } private SimpleCMYKColorSpace() { super(TYPE_CMYK, 4); csRGB = ColorSpace.getInstance(ColorSpace.CS_LINEAR_RGB); } public boolean equals(Object o) { return o != null && o instanceof SimpleCMYKColorSpace; } public int hashCode() { return theInstance.hashCode(); } public float[] toRGB(float[] colorvalue) { float C = colorvalue[0]; float M = colorvalue[1]; float Y = colorvalue[2]; float K = colorvalue[3]; float K1 = 1.0F - K; // Convert from CMYK to linear RGB. float[] rgbvalue = new float[] {K1*(1.0F - C), K1*(1.0F - M), K1*(1.0F - Y)}; // Convert from linear RGB to sRGB. for (int i = 0; i < 3; i++) { float v = rgbvalue[i]; if (v < 0.0F) v = 0.0F; if (v < 0.0031308F) { rgbvalue[i] = 12.92F * v; } else { if (v > 1.0F) v = 1.0F; rgbvalue[i] = (float)(1.055 * Math.pow(v, power1) - 0.055); } } return rgbvalue; } public float[] fromRGB(float[] rgbvalue) { // Convert from sRGB to linear RGB. for (int i = 0; i < 3; i++) { if (rgbvalue[i] < 0.040449936F) { rgbvalue[i] /= 12.92F; } else { rgbvalue[i] = (float)(Math.pow((rgbvalue[i] + 0.055)/1.055, 2.4)); } } // Convert from linear RGB to CMYK. float C = 1.0F - rgbvalue[0]; float M = 1.0F - rgbvalue[1]; float Y = 1.0F - rgbvalue[2]; float K = Math.min(C, Math.min(M, Y)); // If K == 1.0F, then C = M = Y = 1.0F. if(K != 1.0F) { float K1 = 1.0F - K; C = (C - K)/K1; M = (M - K)/K1; Y = (Y - K)/K1; } else { C = M = Y = 0.0F; } return new float[] {C, M, Y, K}; } public float[] toCIEXYZ(float[] colorvalue) { return csRGB.toCIEXYZ(toRGB(colorvalue)); } public float[] fromCIEXYZ(float[] xyzvalue) { return fromRGB(csRGB.fromCIEXYZ(xyzvalue)); } }