Convert RGB PNG to CMYK JPEG (using ICC Color Profiles)

问题

I need to convert a PNG-File into a CMYK JPEG.

During my research i've found multiple articles on SO decribing that problem. I've copied this answer using BufferedImage and ColorConvertOp.

I came up with this little example:

public static void main(final String[] args) throws IOException
{
    final String imageFile = "/tmp/page0.png";

    final BufferedImage pngImage = ImageIO.read(new File(imageFile));

    // convert PNG to JPEG
    // http://www.mkyong.com/java/convert-png-to-jpeg-image-file-in-java/
    final BufferedImage rgbImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage.TYPE_INT_RGB);
    rgbImage.createGraphics().drawImage(pngImage, 0, 0, Color.WHITE, null);

    // RGB to CMYK using ColorConvertOp
    // https://stackoverflow.com/questions/380678/how-to-set-icc-color-profile-in-java-and-change-colorspace/2804370#2804370
    final ICC_Profile ip = ICC_Profile.getInstance("icc/ISOcoated_v2_300_eci.icc");
    // final ICC_Profile ip = ICC_Profile.getInstance("icc/CoatedFOGRA27.icc");
    // final ICC_Profile ip = ICC_Profile.getInstance("icc/USWebUncoated.icc");

    final ColorConvertOp cco = new ColorConvertOp(new ICC_ColorSpace(ip), null);
    final BufferedImage cmykImage = cco.filter(rgbImage, null);

    // Write the result into an bytearray
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(cmykImage, "jpg", baos);
    baos.flush();

    final byte[] imageInByte = baos.toByteArray();
}

The problem is, that it leads me into this exception:

Exception in thread "main" javax.imageio.IIOException: Invalid argument to native writeImage
    at com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeImage(Native Method)
    at com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeOnThread(JPEGImageWriter.java:1058)
    at com.sun.imageio.plugins.jpeg.JPEGImageWriter.write(JPEGImageWriter.java:360)
    at javax.imageio.ImageWriter.write(ImageWriter.java:615)
    at javax.imageio.ImageIO.doWrite(ImageIO.java:1612)
    at javax.imageio.ImageIO.write(ImageIO.java:1578)
    at ... .pdf.ReportGeneratorPublicContentTest.main(ReportGeneratorPublicContentTest.java:69)

The message of the Exception doesn't help me. On this thread they say that sun jdk or JAI will fix the problem.

I tried apt-get install libjai-core-java and the oracle JDK jdk1.7.0_51. The error still persists.

回答1:

@Christian Schneider : After i download your image file with link of CMYK JPEG, i open file's property. I see color space of image is still RGB. This picture isn't converted to CMYK color. Please see the below link :

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

lovelywib 's answer solved this.

回答2:

The problem was solved by using TYPE_3BYTE_BGR instead of TYPE_INT_RGB.

public static void main(String[] args) throws Exception
{
    final String imageFile = "/tmp/page0.png";

    final BufferedImage pngImage = ImageIO.read(new File(imageFile));

    // convert PNG to JPEG
    // http://www.mkyong.com/java/convert-png-to-jpeg-image-file-in-java/
    final BufferedImage rgbImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
    rgbImage.createGraphics().drawImage(pngImage, 0, 0, Color.WHITE, null);

    // RGB to CMYK using ColorConvertOp
    // http://stackoverflow.com/questions/380678/how-to-set-icc-color-profile-in-java-and-change-colorspace/2804370#2804370
    final ICC_Profile ip = ICC_Profile.getInstance("icc/USWebUncoated.icc");

    final ColorConvertOp cco = new ColorConvertOp(rgbImage.getColorModel().getColorSpace(), new ICC_ColorSpace(ip), null);

    final BufferedImage cmykImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage.TYPE_3BYTE_BGR);

    cco.filter(rgbImage, cmykImage);

    // Write the result into an bytearray
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(cmykImage, "JPEG", baos);
    baos.flush();
}

• RGB PNG: https://raw.github.com/d0x/questions/master/stackoverflowPlayground/src/main/resources/so22298328/page0.png

• CMYK JPEG: https://raw.github.com/d0x/questions/master/stackoverflowPlayground/src/main/resources/so22298328/page0.cmyk.jpg

• Maven Code at GitHub: https://github.com/d0x/questions/blob/master/stackoverflowPlayground/src/main/java/so22298328/Main.java

来源：https://stackoverflow.com/questions/22298328/convert-rgb-png-to-cmyk-jpeg-using-icc-color-profiles