jamesw: I've seen a few like that one too - fuzzy wuzzy photo syndrome. Unless you have some sort of professional set up, use a scanner instead of a camera. Cameras may be necessary for massive large bulky lots, but not a single stamp (or even a page of stamps) or cover.
There's also a SCF member here who needs to crop his images - I see them in the
ebay ad at the top of page on occasion. I forgot his userid, but it only takes seconds to crop and save an image. I would recommend IrfanView; a free downloadable program, that can process hundreds to thousands of images in very little time.