Just because an image is created on a computer, does not govern whether or not it is art. The computer is just a tool, like paints, charcoal or canvas. When I create illustrations I sometimes work with a rough sketch I've made and scanned in, but that is only the starting idea. The art on my illustration site,
http://www.suoakesart.com
is done in Adobe Illustrator and is created from my own sketches and ideas. But most of this is "fleshed out" on screen. There are some advantages of working with digital files, (portabliltiy, scalibility of vector images, and doing something over so many times I would have worn a hole in the paper with traditional media!) yet, nothing beats the tactile feeling of pencil to paper or paint to canvas. I see these two worlds as different facets of the whole of the creative process.