Comparision between Photoshop & GIMP
||Linux & also in more operative system than photoshop.
||Less or zero cost
|Advance & advantage
||More powerful & advance over Gimp like Color management. It has support 16 bit, 32 bit & floating point images.
||Less advance compare to windows photoshop. Gimp features don't support the plugins designed for photoshop.
||Photoshop SDK requires authorization.
||Plugin development not limited to developers.