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/* * @(#)ICC_ProfileRGB.java 1.23 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ /********************************************************************** ********************************************************************** ********************************************************************** *** COPYRIGHT (c) Eastman Kodak Company, 1997 *** *** As an unpublished work pursuant to Title 17 of the United *** *** States Code. All rights reserved. *** ********************************************************************** ********************************************************************** **********************************************************************/ package java.awt.color; import java.awt.image.LookupTable; import sun.awt.color.ProfileDeferralInfo; /** * * The ICC_ProfileRGB class is a subclass of the ICC_Profile class * that represents profiles which meet the following criteria: * <ul> * <li>The profile's color space type is RGB.</li> * <li>The profile includes the <code>redColorantTag</code>, * <code>greenColorantTag</code>, <code>blueColorantTag</code>, * <code>redTRCTag</code>, <code>greenTRCTag</code>, * <code>blueTRCTag</code>, and <code>mediaWhitePointTag</code> tags.</li> * </ul> * The <code>ICC_Profile</code> <code>getInstance</code> method will * return an <code>ICC_ProfileRGB</code> object when these conditions are met. * Three-component, matrix-based input profiles and RGB display profiles are * examples of this type of profile. * <p> * This profile class provides color transform matrices and lookup tables * that Java or native methods can use directly to * optimize color conversion in some cases. * <p> * To transform from a device profile color space to the CIEXYZ Profile * Connection Space, each device color component is first linearized by * a lookup through the corresponding tone reproduction curve (TRC). * The resulting linear RGB components are converted to the CIEXYZ PCS * using a a 3x3 matrix constructed from the RGB colorants. * <pre> * * linearR = redTRC[deviceR] * * linearG = greenTRC[deviceG] * * linearB = blueTRC[deviceB] * * _ _ _ _ _ _ * [ PCSX ] [ redColorantX greenColorantX blueColorantX ] [ linearR ] * [ ] [ ] [ ] * [ PCSY ] = [ redColorantY greenColorantY blueColorantY ] [ linearG ] * [ ] [ ] [ ] * [_ PCSZ _] [_ redColorantZ greenColorantZ blueColorantZ _] [_ linearB _] * * </pre> * The inverse transform is performed by converting PCS XYZ components to linear * RGB components through the inverse of the above 3x3 matrix, and then converting * linear RGB to device RGB through inverses of the TRCs. * <p> */ public class ICC_ProfileRGB extends ICC_Profile { /** * Used to get a gamma value or TRC for the red component. */ public static final int REDCOMPONENT = 0; /** * Used to get a gamma value or TRC for the green component. */ public static final int GREENCOMPONENT = 1; /** * Used to get a gamma value or TRC for the blue component. */ public static final int BLUECOMPONENT = 2; /** * Constructs an new <code>ICC_ProfileRGB</code> from a CMM ID. * * @param ID The CMM ID for the profile. * */ ICC_ProfileRGB(long ID) { super(ID); } /** * Constructs a new <code>ICC_ProfileRGB</code> from a * ProfileDeferralInfo object. * * @param pdi */ ICC_ProfileRGB(ProfileDeferralInfo pdi) { super(pdi); } /** * Returns an array that contains the components of the profile's * <CODE>mediaWhitePointTag</CODE>. * * @return A 3-element <CODE>float</CODE> array containing the x, y, * and z components of the profile's <CODE>mediaWhitePointTag</CODE>. */ public float[] getMediaWhitePoint() { return super.getMediaWhitePoint(); } /** * Returns a 3x3 <CODE>float</CODE> matrix constructed from the * X, Y, and Z components of the profile's <CODE>redColorantTag</CODE>, * <CODE>greenColorantTag</CODE>, and <CODE>blueColorantTag</CODE>. * <p> * This matrix can be used for color transforms in the forward * direction of the profile--from the profile color space * to the CIEXYZ PCS. * * @return A 3x3 <CODE>float</CODE> array that contains the x, y, and z * components of the profile's <CODE>redColorantTag</CODE>, * <CODE>greenColorantTag</CODE>, and <CODE>blueColorantTag</CODE>. */ public float[][] getMatrix() { float[][] theMatrix = new float[3][3]; float[] tmpMatrix; tmpMatrix = getXYZTag(ICC_Profile.icSigRedColorantTag); theMatrix[0][0] = tmpMatrix[0]; theMatrix[1][0] = tmpMatrix[1]; theMatrix[2][0] = tmpMatrix[2]; tmpMatrix = getXYZTag(ICC_Profile.icSigGreenColorantTag); theMatrix[0][1] = tmpMatrix[0]; theMatrix[1][1] = tmpMatrix[1]; theMatrix[2][1] = tmpMatrix[2]; tmpMatrix = getXYZTag(ICC_Profile.icSigBlueColorantTag); theMatrix[0][2] = tmpMatrix[0]; theMatrix[1][2] = tmpMatrix[1]; theMatrix[2][2] = tmpMatrix[2]; return theMatrix; } /** * Returns a gamma value representing the tone reproduction curve * (TRC) for a particular component. The component parameter * must be one of REDCOMPONENT, GREENCOMPONENT, or BLUECOMPONENT. * <p> * If the profile * represents the TRC for the corresponding component * as a table rather than a single gamma value, an * exception is thrown. In this case the actual table * can be obtained through the {@link #getTRC(int)} method. * When using a gamma value, * the linear component (R, G, or B) is computed as follows: * <pre> * * gamma * linearComponent = deviceComponent * *</pre> * @param component The <CODE>ICC_ProfileRGB</CODE> constant that * represents the component whose TRC you want to retrieve * @return the gamma value as a float. * @exception ProfileDataException if the profile does not specify * the corresponding TRC as a single gamma value. */ public float getGamma(int component) { float theGamma; int theSignature; switch (component) { case REDCOMPONENT: theSignature = ICC_Profile.icSigRedTRCTag; break; case GREENCOMPONENT: theSignature = ICC_Profile.icSigGreenTRCTag; break; case BLUECOMPONENT: theSignature = ICC_Profile.icSigBlueTRCTag; break; default: throw new IllegalArgumentException("Must be Red, Green, or Blue"); } theGamma = super.getGamma(theSignature); return theGamma; } /** * Returns the TRC for a particular component as an array. * Component must be <code>REDCOMPONENT</code>, * <code>GREENCOMPONENT</code>, or <code>BLUECOMPONENT</code>. * Otherwise the returned array * represents a lookup table where the input component value * is conceptually in the range [0.0, 1.0]. Value 0.0 maps * to array index 0 and value 1.0 maps to array index length-1. * Interpolation might be used to generate output values for * input values that do not map exactly to an index in the * array. Output values also map linearly to the range [0.0, 1.0]. * Value 0.0 is represented by an array value of 0x0000 and * value 1.0 by 0xFFFF. In other words, the values are really unsigned * <code>short</code> values even though they are returned in a * <code>short</code> array. * * If the profile has specified the corresponding TRC * as linear (gamma = 1.0) or as a simple gamma value, this method * throws an exception. In this case, the {@link #getGamma(int)} * method should be used to get the gamma value. * * @param component The <CODE>ICC_ProfileRGB</CODE> constant that * represents the component whose TRC you want to retrieve: * <CODE>REDCOMPONENT</CODE>, <CODE>GREENCOMPONENT</CODE>, or * <CODE>BLUECOMPONENT</CODE>. * * @return a short array representing the TRC. * @exception ProfileDataException if the profile does not specify * the corresponding TRC as a table. */ public short[] getTRC(int component) { short[] theTRC; int theSignature; switch (component) { case REDCOMPONENT: theSignature = ICC_Profile.icSigRedTRCTag; break; case GREENCOMPONENT: theSignature = ICC_Profile.icSigGreenTRCTag; break; case BLUECOMPONENT: theSignature = ICC_Profile.icSigBlueTRCTag; break; default: throw new IllegalArgumentException("Must be Red, Green, or Blue"); } theTRC = super.getTRC(theSignature); return theTRC; } }