I'm trying to expand my knowledge of photoshop, and one of the things I've been playing with is the layer modes. I can obviously see what each one does, but I don't understand why, for examply, overlay mode has a different effect compared with say, lighten. If I knew what each mode was trying to accomplish, I think I could better use that feature. Does anyone out there know, or can give me the link to an article which explains it? Thanks :)