When it comes to high-end image manipulation, there are really only two options right now: Photoshop and GIMP. GIMP doesn't quite capture the usability and polish of Adobe's offering, but where it does beat Photoshop is in price - totally free and open source is a whole lot easier on the pocketbook than the $700 or so that a legal copy of Photoshop will run you. And even if it's not totally perfect, GIMP is full-featured enough for almost any photo manipulation needs you might have.
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