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

Question

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.

score 0 · Answer 1 · edited May 23 '17 at 12:34

0

@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.

edited May 23 '17 at 12:34

Community

1
1

answered Oct 02 '14 at 07:48

Han Kun

73
12

d0x · Accepted Answer · 2014-03-11T12:45:59.303

-1

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();
}

edited Mar 11 '14 at 12:45

answered Mar 10 '14 at 11:41

d0x

11,040
17
69
104

Does the image look OK? I don't understand how the `TYPE_3BYTE_BGR` image can even hold the resulting image data, as there is not enough channels (RGB == 3 channels cs CMYK == 4 channels). Unfortunately, writing a CMYK JPEG using the normal `JPEGImageWriter` is something of a black art, but it should be possible by writing `Raster`. – Harald K Mar 11 '14 at 08:32
@haraldK it is a little bit darker. – d0x Mar 11 '14 at 12:33
1

@haraldK i added the converted screenshots and a link to a running maven project at github – d0x Mar 11 '14 at 12:46
Thanks for sharing those links! Just as I thought, your JPEG is *not* a CMYK JPEG, it's a normal YCbCr 4:2:2 subsampled JFIF (without embedded ICC profile). But this might be just what you need/expect, so I'm happy if you are happy. :-) – Harald K Mar 11 '14 at 19:32
@haraldK actually I would be happy if the image is not that dark. I don't know anything about all this ICC Profiles. For me it's mandatory to have a CMYK JPEG File to add it into a PDF/X-3 file using iText. That's why I do this :). Feel free to enhance the answer or put an own one. – d0x Mar 11 '14 at 23:15
1

I see. I think the code in your *question* is logically sound (unfortunately, the `JPEGImageWriter` doesn't support CMYK `BufferedImage`s per now, so you'll get an exception). The one in your answer isn't. As I said, the 3 channel RGB image `cmykImage` doesn't even have enough channels to hold CMYK data... And you can't change the color model/number of channels of a `BufferedImage` after creation. Maybe iText converts the JPEG to CMYK for you, or CMYK isn't really mandatory? I'm working on a project to simplify all this, but in the mean time, I think I'll just have to leave it up to you. :-/ – Harald K Mar 12 '14 at 12:39

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

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