Debian Package a Day ( debaday) wrote,
Debian Package a Day
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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.


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