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actually no, its not that hard to do the cropping.. its like calculating the normal crop.. only you use a different formula...
but you need 4 extra fields in database so that the "crop is remembered" if the user decides to modify the crop.. (example: zoom in by 3x the bottom left corner)
otherwise his crop is lost when you rebuild the thumbnails..
but thats going off topic.. sorry,
Luc
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