[vox-tech] Changing the print resolution of JPEG images by script

[Henry House]

One of the more common operations that I need to do with JPEG images is to
change their print resolution so that when printed (e.g., as included
figures in a LaTeX document) they print at 300 dpi (for example) instead of
72 dpi. I have been doing this in the Gimp. This causes the JPEGs to be
recompressed with loss of quality when the Gimp saves the files.

- Is there any ways to change the print resolution, short of editing the
  JPEGs by hand, without recompressing them?

- Is there any utility in existance that could do this from the command
  line? I tried the jpegtran program from libjpeg-progs in Debian, but it
  does not seem to have this capability.

-- 
Henry House
+1 530 753 3361 ext. 13
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