It is designed for Linux, that's true. But bear in mind that it is as powerful as Photoshop in many respects, but takes a while to get used to. Maybe it's not quite as flexible. I don't know a lot of Photoshop-equivilants, mostly because my Dad is a graphics designer and as a result I've always had a free, legal copy of Photoshop at my disposal - I'm very lucky there. The few other Mac graphics packages I know of are very old and out of date (GraphicsConverter and ClarisWorks spring to mind).