Your best bet for a lossless JPEG crop is to use ImageMagick or the JPEG
utils rather than GIMP.  IIRC, there has been talk about allowing GIMP to do
the few lossless JPEG transforms that are possible, but I haven't seen
patches or release notes to the effect. something like 

jpegtran -perfect -crop 50x50+23+10 input.jpg output.jpg 

Would do the trick 

BTW, even the guys that designed the JPEG library say that 100 should never
be used (and it doesn't mean what everybody thinks it means either)


Computer Science is as much about computers as astronomy is about telescopes
        -- Edsger Wybe Dijkstra (1930-2002)

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