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> Unless you're going to be saving in a different (ie. lossless) format, you're > going to be recompressing the image when you crop it.
Not true. In theory, if you are happy to crop to 16 pixel boundaries you should be able to do it without recompressing. A quick google for 'crop jpeg "no recompress"' yielded a bunch of (commercial) results that claimed to do just that. I could have sworn there was some free code somewhere to do this though, or perhaps it was rotate instead. It's much like mp3trim and trimming to frame-boundaries.
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