Since we use and embed xmlgraphics-commons for the sake of FOP anyway, I
tried to use the PNG encoding / decoding classes in another context of
our application (thus, not at all related to FOP or Batik).
In two different places at least we need to write or process (read -
process - write) PNG images with their PHYS metadata.
Since the documentation on using xmlgraphics-commons in general is
rather scarce, I tried to figure out myself how to use these classes by
reading the code and tried this.
PNGDecodeParam decodeParam = new PNGDecodeParam();
decodeParam.setGenerateEncodeParam(true);
PNGImageDecoder decoder = new PNGImageDecoder(new
FileInputStream(sourceFile), decodeParam);
RenderedImage srcImage = decoder.decodeAsRenderedImage();
// Some irrelevant code removed here
BufferedImage dstImage = new
BufferedImage(srcImage.getWidth(), srcImage.getHeight(),
BufferedImage.TYPE_3BYTE_BGR);
// Some processing here...
PNGEncodeParam encodeParam = decodeParam.getEncodeParam();
System.out.println("Physical dimensions set ?" +
encodeParam.isPhysicalDimensionSet());
System.out.println("Physical dimensions:" +
encodeParam.getPhysicalDimension()[0]);
PNGImageEncoder encoder = new PNGImageEncoder(new
FileOutputStream(destinationFile), encodeParam);
encoder.encode(dstImage);
Hoping this would propagate the PNG metadata (among which ICCProfile and
physical dimensions) from source to destination.
Well the image processing code works well and the output file is
properly encoded, but without any metadata.
What did I miss in the process ?
Thanks for helping !
Jean-Francois
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