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Код



Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpeg");
ImageReader reader = null;
while (readers.hasNext()){
      reader = readers.next();
      if (reader.canReadRaster()){
          break;
      }
}
// читаю поток
ImageInputStream ios = ImageIO.createImageInputStream(new FileInputStream(new File(myCMYKPic.jpg)));
reader.setInput(ios);

// читаю растер они имеет numBand = 4 
Raster srcCMYKRaster = reader.readRaster(0, null);

// беру профайл (пробовал разные) и создаю колорспейс
ICC_Profile cmykProfile = ICC_Profile.getInstance(new FileInputStream("Generic_CMYK Profile.icc"));
ColorSpace cmykCS = new ICC_ColorSpace(cmykProfile);
ColorSpace rgbCS = ICC_ColorSpace.getInstance(ICC_ColorSpace.CS_sRGB);

ColorConvertOp cmykToRgb = new ColorConvertOp(cmykCS, rgbCS, null);
WritableRaster resultRGBRaster = cmykToRgb.filter(srcCMYKRaster, null);

int[] bits = new int[3];
for (int i = 0; i < bits.length; i++)
    bits[i] = 8;

// создаю ргб модель
ColorModel cm = new ComponentColorModel(rgbCS, bits, false, false, ColorModel.OPAQUE, resultRGBRaster.getTransferType());
// записываю растр в изобраение в ргб
BufferedImage result = new BufferedImage(cm, wr, false, null);
 
// write
ImageIo.write(result, "jpg", new File("myRGBPic.jpg"));

Код


cmykToRgb.filter(srcCMYKRaster, null);

Код


  convert cmyk.jpg -colorspace RGB rgb.jpg

Код


public void convert(String sourceImg, String targetImg){
        ProcessBuilder pb = new ProcessBuilder("convert", sourceImg, "-colorspace", "RGB", targetImg);
        pb.redirectErrorStream(true);
        
        StringBuffer error = new StringBuffer();
        Process p;
        try {
            p = pb.start();
            BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = null;
            while((line=br.readLine())!=null){
                error.append(line + "\n");
            }
            retCode = p.waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if(error.length() > 0)
        {
            System.err.println(error);
        }
}

Код


    public static BufferedImage cmykRasterToSRGB(Raster raster, ICC_Profile cmykProfile) {
        int w = raster.getWidth();
        int h = raster.getHeight();

        ColorSpace cmykCS = new ICC_ColorSpace(cmykProfile);
        BufferedImage rgbImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        WritableRaster rgbRaster = rgbImage.getRaster();
        ColorSpace rgbCS = rgbImage.getColorModel().getColorSpace();
        ColorConvertOp cmykToRgb = new ColorConvertOp(cmykCS, rgbCS, null);
        cmykToRgb.filter(raster, rgbRaster);
        return rgbImage;
    }