Pixel is a RGB, CMYK and HDR image editing, photo retouching, graphics manipulating and animation program available for many operating systems formerly known as Pixel32.
From the Jeff’s page:
One of the age-long problems with the Linux operating system was never the lack of functionality but the lack of major commercial applications porting their software to Linux. The movie industry has shown high demand for such software to be ported and, after a long wait, companies such as Autodesk and Softimage have ported fully supported Linux versions of their applications for their dedicated customers.
So now you have a new program called Pixel and it just costs under $40. It is not free software, if you like it and want to support its development, you may consider purchasing a copy. Licensing and prices are very fair, and include unlimited support.