One thing to be aware of when making circular (and probably other
non-rectangular) crops is that if you want to save the cropped image as is you
must choose a format which supports transparent background; otherwise you end
up with a round image in a white square. JPEG, for instance, does not support
this and you end up with an image that looks the same as if you'd done a
rectangular crop from a white background. GIF is one format that does support
transparent background. Then you can paste the round image onto something else
and not see any white corners.
Mark Minton
