how can I convert an RGB image to CMYK and vice versa in Java?

Question

our web app let users download dynamically generated images in different formats (bmp, png and jpeg). Some of our users download the images for printing, thus we would like

Answer 1

To convert RGB image to CMYK image by Java, one of the easiest way is to use JAI (Java Advanced Image).

Download JAI: http://download.java.net/media/jai/builds/release/1_1_3/

DownLoad JAI ImageIO: http://download.java.net/media/jai-imageio/builds/release/1.1/

Here is the code:

public static void rgbToCmyk() throws IOException{

    BufferedImage rgbImage = ImageIO.read(new File("C://Users//Public//Pictures//Sample Pictures//RGB_IMAGE.jpg"));
    BufferedImage cmykImage = null;
    ColorSpace cpace = new ICC_ColorSpace(ICC_Profile.getInstance(RbgToCmyk.class.getClassLoader().getResourceAsStream("ISOcoated.icc")));
    ColorConvertOp op = new ColorConvertOp(rgbImage.getColorModel().getColorSpace(), cpace, null);       
    cmykImage = op.filter(rgbImage, null);

    JAI.create("filestore", cmykImage, "c:/tmp/CMYK_IMAGE.TIF", "TIFF");
}

NOTE: "ISOcoated.icc" is my ICC profile. You can get it from your printer or somewhere else.