Just to follow this post up, I've found that the Independent JPEG Group
have developed a utility called 'jpegtran' which performs lossless
transformations on JPEG images. This webpage:
http://sylvana.net/jpegcrop/losslessapps.html
contains a very long list of the various apps which support this
functionality either directly by calling jpegtran or indirectly by using
code based on jpegtran.
HTH
Mark
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