Write CMYK image in PDF

Question

I need to add a CMYK Image (java.awt.BufferedImage) to a Pdf-Document with iText.

I'm trying to do it with:

com.lowagie.text.Image img = Image.getInstance(BufferedImage, bgColor);

This produces an RGB image in the resulting PDF. (and I suppose it's a bug, because it just ignores ColorModel). However I could use:

com.lowagie.text.Image img = Image.getInstance(byte[] rawData);

And it produces a correct CMYK-Image in PDF. But for the second case I need to convert java.awt.BufferedImage in ByteArray. I cannot do it with ImageIO.write(ByteArrayOutputStream). I also cannot do it with com.sun.image.codec.jpeg.JPEGImageEncoder because I must use OpenJDK.

Any ideas how can I achieve the correct behavior to write a CMYK image in PDF using iText?

Answer 1

So basically what you're asking is how to convert a BufferedImage to a byte[] to print to PDF?

BufferedImage img; // your image to be printed
String formatName; // name of the image format (see ImageIO docs)
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write( img, formatName, baos);
byte[] rawData = baos.toByteArray();

You should be able to use that for the CMYK-image as you had in your original post:

com.lowagie.text.Image img = Image.getInstance(byte[] rawData);