Read the full post for details.
While looking for some examples of notan to share with my color theory students I found a wonderful discussion of notan with thumbnail sketches by Robert Sloan. I wanted to share it with all of you.
He also mentions using a software called "Gimp". It's free and he says you can do everything with it that Photoshop can do. I don't know about that since I haven't used it. I do know that not everyone has the need for Photoshop, but many could still use some photo-manipulation software—this might be just the thing to look at.
If you would like to read what I have written about Notan in the past you can read my two favorite posts on it: