Comparing images in the Diff view of Bazaar Explorer

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http://askubuntu.com – In case of some image formats, the Diff view in Bazaar Explorer shows the two versions of changed image files (before vs after). This seems to work for png but not for jpg. You can see what I mean with this command: bzr qdiff -c6 lp:~janos-gyerik/+junk/diff-images The changed png file is rendered in the left and right panels, but the jpg is not, it is handled just like any generic binary format, showing only the size difference. Is there a documentation somewhere with the list of supported formats? (HowTos)