Ivar,
Attached is an example that shows how to convert an RGB image to CMYK
(and saves it in JPEG format, which you may not be interested in).
You will need a CMYK profile for the conversion.
I hope this helps.
Regards.
Vincent Hardy.
Ivar Vasara wrote:
>
> Hi there,
> I would have imagined the answer to this question would be archived over
> the place, but I can't seem to find it..
> What I would like to know is : is there a (easy) way to change the colour
> mode of an image (BufferedImage) ? Specifically, I would like to convert an
> RGB image to CMYK.
>
> After consulting the docs at :
> http://java.sun.com/products/java-media/2D/forDevelopers/2Dapi/java/awt/imag
> e/BufferedImage.html
> I'm not even sure there *is* a CMYK mode..
>
> Thanks,
> Ivar Vasara
>
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/*
* @(#)CMYKSave.java
*
* Copyright (c) 1999 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
package com.sun.glf.snippets;
import java.awt.image.*;
import java.awt.color.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import com.sun.image.codec.jpeg.*;
import com.sun.glf.util.Toolbox;
/**
* This program reads an RGB JPEG image and converts it to a CMYK image. Optionally,
* it can can invert the CMYK components before saving the image as some popular
* image tools use inverted value for the CMYK components.
*
* @author Vincent Hardy
* @version 1.0, 02/01/1999
*/
public class CMYKSave{
static final String USAGE = "java com.sun.glf.snippets.CMYKSave <cmykProfile>
<rgbJPEGFile> <cmykJPEGFile> <invert=yes|no>";
public static void main(String args[]) throws Exception{
if(args.length<4){
System.out.println(USAGE);
System.exit(0);
}
String cmykProfile = args[0];
String rgbJPEGFile = args[1];
String cmykJPEGFile = args[2];
boolean invert = "true".equalsIgnoreCase(args[3]);
//
// First, load input image
//
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new
FileInputStream(rgbJPEGFile));
BufferedImage rgbImage = decoder.decodeAsBufferedImage();
// Create a CMYK Color Space from cmykProfile
ICC_Profile p = ICC_Profile.getInstance(new FileInputStream(cmykProfile));
ColorSpace cmykCS = new ICC_ColorSpace(p);
OutputStream out = new FileOutputStream(cmykJPEGFile);
// ColorConvert rgbImage to CMYK
ColorSpace rgbCS = rgbImage.getColorModel().getColorSpace();
ColorConvertOp rgbToCmyk = new ColorConvertOp(rgbCS, cmykCS, null);
// Create a ColorModel for destination CMYK image
ColorModel cmykModel = new ComponentColorModel(cmykCS,
new int[] { 8, 8, 8, 8 }, // 8 bits
for each C, M, Y, K
false, true, // No alpha
Transparency.OPAQUE,
DataBuffer.TYPE_BYTE);
WritableRaster cmykRaster =
cmykModel.createCompatibleWritableRaster(rgbImage.getWidth(),
rgbImage.getHeight());
// Convert to CMYK now
rgbToCmyk.filter(rgbImage.getRaster(), cmykRaster);
// Invert components before saving if requested
if(invert){
System.out.println("Inverting CMYK bands");
byte swap[] = new byte[256];
for(int i=0; i<swap.length; i++){
swap[i] = (byte)(255-i);
}
LookupTable lookup = new ByteLookupTable(0, new byte[][] { swap, swap, swap,
swap });
LookupOp luop = new LookupOp(lookup, null);
cmykRaster = luop.filter(cmykRaster,
cmykRaster.createCompatibleWritableRaster());
}
// Finally, save CMYK raster
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(cmykRaster,
JPEGDecodeParam.COLOR_ID_CMYK);
param.setQuality(1, false);
encoder.encode(cmykRaster, param);
out.close();
System.out.println("Image saved successfully in " + cmykJPEGFile);
}
}
