It can do color separation. I do that for cyanotype and carbon negatives. It's a little round about that someone programmed for it. That's the benefit of opensource. If you know how, you can make it quak like a duck and look like a cow. If you want it to bark but don't know how, just search to see if someone has done it or if someone will help you do it.

As a side commentary, a friend of mine owns a Cessna and flies around it. He also flies around it. And he can fly the Cessna too. Anyway, if you ever took a look at the dashboard of a 737, it looks nothing like the Cessna. But both fly pretty good. So if you wanna fly all the time without the captain telling you what peanut to chew when, then get your little Gimp plane and fly. Otherwise, you wanna do the same as the rest of the sheeple, just find your seat and ask the attendant to do the art for you while you watch how its done out the side window. I'm sure you can get paid the big bucks for that. Being sarcastic ofcourse, plus how can you concentrate with the darn open hole where the safety door used to be.