RiscOS port of the Independant JPEG Group utilities version 6b:
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Here's a port of the latest of the IJG utilities (I don't think anyone cared
to do it before), namely:

cjpeg: compress a full-colour targa or PPM into a JFIF file (aka JPEG).

djpeg: reverse of above operation.

rdjpgcom: read comments inside a JFIF file. Probably useful for people who
want a weak form of copyright for their artwork. However, for some reasons,
it seems the Shared C Library can not handle the accented caracters of ISO
8859-1 (Latin1), and rdjpgcom suffers from this.

wrjpgcom: insert a comment inside a JFIF file.

jpegtran: apply lossless transforms to a JFIF file (for instance, add or
remove the progressive feature, or rotate 90/180/270)

I can't say I've tested all the options, but apart from the accented
caracters glitch, I haven't noticed anything else. I think it's safe to
replace the cjpeg and djpeg programs supplied for instance in ChangeFSI and
ArcWeb by the newer versions (and perhaps you'll notice a speed-up), but
you're strongly encouraged to rename the old version just in case an annoying
bug rears its head.

Jrme Mathevet