"lossless" jpeg crop
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"Lossless" jpeg crop would be very nice to have. Ben Jackson and Guido Vollbeding have some code to do it here:
http://www.ben.com/jpeg/
http://sylvana.net/jpegcrop/jpegtran/
Something like Guido's crop'n'drop (i.e., lossless cut/copy/paste) would be totally awesome.