Here are the results of playing a little bit in Photoshop Elements. I took two pictures, one of the light side of my piles and one of the right. There is a problem in that one of them used flash and the other didn't (not sure why) so that could be affecting the experiment. But whatever. I don't have time to do it again. This isn't a science lab. I think that three light piles (white -ish, Light, and Medium-Light) are pretty good. The blues in the M-L pile might want to move to medium. The second photo, with the Medium, Medium-dark and Dark is not so good. The darks are okay, but Medium and Medium-dark are a complete jumble.