JPEG image with wrong colors

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I found a solution now, that works, at least if my resulting image is also a JPEG:
First I read the image (from byte array imageData), and most important, I also read the metadata.

InputStream is = new BufferedInputStream(new ByteArrayInputStream(imageData));
Image src = null;
Iterator<ImageReader> it = ImageIO.getImageReadersByMIMEType("image/jpeg");
ImageReader reader = it.next();
ImageInputStream iis = ImageIO.createImageInputStream(is);
reader.setInput(iis, false, false);
src = reader.read(0);
IIOMetadata imageMetadata = reader.getImageMetadata(0);

Now i’d do some converting (i.e. shrink in size) … and at last I’d write the result back as a JPEG image. Here it is most important to pass the metadata we got from the original image to the new IIOImage.

Iterator<ImageWriter> iter = ImageIO.getImageWritersByMIMEType("image/jpeg");
ImageWriter writer = iter.next();
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(jpegQuality);
ImageOutputStream imgOut = new MemoryCacheImageOutputStream(out);
writer.setOutput(imgOut);
IIOImage image = new IIOImage(destImage, null, imageMetadata);
writer.write(null, image, iwp);
writer.dispose();

Unfortunately, if I’d write a PNG image, I still get the wrong colors (even if passing the metadata), but I can live with that.

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