I'd recommend you use Image I/O instead. The codecs here are nice for
certain use cases but there are too few people around here to help
maintain and support the code. With Image I/O you have a much bigger
pool of people that can help you if you run into problems. And Image I/O
is also already available to your application if you're using Java 1.4
or later.
On 17.09.2008 06:39:12 Jean-François El Fouly wrote:
> 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
>
>
>
Jeremias Maerki
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