| /* GrayProfileConverter.java -- Gray profile conversion class |
| Copyright (C) 2004 Free Software Foundation |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.awt.color; |
| |
| import java.awt.color.ICC_Profile; |
| import java.awt.color.ICC_ProfileGray; |
| import java.awt.color.ProfileDataException; |
| |
| /** |
| * GrayProfileConverter - converts Grayscale profiles (ICC_ProfileGray) |
| * |
| * This type of profile contains a single tone reproduction curve (TRC). |
| * Conversion consists of simple TRC lookup. |
| * |
| * This implementation is very lazy and does everything applying the TRC and |
| * utilizing the built-in linear grayscale color space. |
| * |
| * @author Sven de Marothy |
| */ |
| public class GrayProfileConverter implements ColorSpaceConverter |
| { |
| private GrayScaleConverter gc; |
| private ToneReproductionCurve trc; |
| private ColorLookUpTable toPCS; |
| private ColorLookUpTable fromPCS; |
| |
| /** |
| * Constructs the converter described by an ICC_ProfileGray object |
| */ |
| public GrayProfileConverter(ICC_ProfileGray profile) |
| { |
| try |
| { |
| trc = new ToneReproductionCurve(profile.getGamma()); |
| } |
| catch (ProfileDataException e) |
| { |
| trc = new ToneReproductionCurve(profile.getTRC()); |
| } |
| |
| // linear grayscale converter |
| gc = new GrayScaleConverter(); |
| |
| // If a CLUT is available, it should be used, and the TRCs ignored. |
| // Note: A valid profile may only have CLUTs in one direction, and |
| // TRC:s without useful info, making reverse-transforms impossible. |
| // In this case the TRC will be used for the reverse-transform with |
| // unpredictable results. This is in line with the Java specification, |
| try |
| { |
| toPCS = new ColorLookUpTable(profile, ICC_Profile.icSigAToB0Tag); |
| } |
| catch (Exception e) |
| { |
| toPCS = null; |
| } |
| |
| try |
| { |
| fromPCS = new ColorLookUpTable(profile, ICC_Profile.icSigBToA0Tag); |
| } |
| catch (Exception e) |
| { |
| fromPCS = null; |
| } |
| } |
| |
| public float[] toCIEXYZ(float[] in) |
| { |
| if (toPCS != null) |
| return toPCS.lookup(in); |
| float[] gray = new float[1]; |
| gray[0] = trc.lookup(in[0]); |
| return gc.toCIEXYZ(gray); |
| } |
| |
| public float[] toRGB(float[] in) |
| { |
| float[] gray = new float[1]; |
| gray[0] = trc.lookup(in[0]); |
| return gc.toRGB(gray); |
| } |
| |
| public float[] fromRGB(float[] in) |
| { |
| // get linear grayscale value |
| float[] gray = gc.fromRGB(in); |
| gray[0] = trc.reverseLookup(gray[0]); |
| return gray; |
| } |
| |
| public float[] fromCIEXYZ(float[] in) |
| { |
| if (fromPCS != null) |
| return fromPCS.lookup(in); |
| |
| float[] gray = gc.fromCIEXYZ(in); |
| gray[0] = trc.reverseLookup(gray[0]); |
| return gray; |
| } |
| } |