Cannot extract clipping path from JPEG with multiple APP13 segments

Cannot extract clipping path from a JPEG file with multiple APP13/Photoshop 3.0 segments.

Here’s an example with 3 APP13 segments.

Using exiftool I can verify that the file actually does contain clipping path information.

It’s probably related to this part of com.twelvemonkeys.imageio.path.Paths#readPath where only the first segment is evaluated:

List<JPEGSegment> photoshop = JPEGSegmentUtil.readSegments(stream, segmentIdentifiers);
if (!photoshop.isEmpty()) {
  return readPathFromPhotoshopResources(new MemoryCacheImageInputStream(photoshop.get(0).data()));
}

So for this file null is returned because the path information is stored in another segment.

I’ve tried to work around this by processing all segments from the List but this fails with an exception in com.twelvemonkeys.imageio.metadata.psd.PSDReader#read in the switch statement.

I think it might be possible to join the data from all segments into one but haven’t been successful in doing so.

[aerpenbeck]

There’s a similar issue in the Apache Commons Imaging project that has sample files with multiple APP13 segments attached, but those do not have a clipping path defined. Maybe those files could be useful for a test case though.

[haraldk]

The fix is part of the 3.6.3 release out now! 😀