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