Debian Package a Day's Journal

libjpeg-progs - : Programs for manipulating JPEG files

This package contains programs for manipulating JPEG files: cjpeg/djpeg: convert to/from the JPEG file format rdjpgcom/wrjpgcom: read/write comments in JPEG files jpegtran: lossless transformations of JPEG files

Ian B. suggested libjpen-progs. I haven't tried it myself.

libjpeg-progs contains a few command-line scripts:
cjpeg/djpeg: convert to/from the JPEG file format

rdjpgcom/wrjpgcom: read/write comments in JPEG files

jpegtran: lossless transformations of JPEG files

One of the more interesting is jpegtran. Most programs that manipulate images are format-neutral, so they'll decode the jpeg, do the transformation, then reencode -- which means you've double-encoded the file, and you'll have more jpeg distortion; jpegtran can rotate and flip your jpegs without any loss of quality.

More information on this package can be found on the Debian web site.
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