I'm looking to upgrade from Gimp to Photoshop for graphics creation for website and apps - but am unsure of the benefits and costs - are there any good pointers here, and what would I have to do w/ all of my existing projects?
Photoshop does not open XCF files but you can save PSD files from GIMP to open into Photoshop.
One of the major benefits with Photoshop is true CMYK editing. However, I can't see that as a benefit to you if you are not designing for print. As a step up from GIMP, you might look at Adobe Fireworks instead. Fireworks is better suited for UI design and prototyping.
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