How can I make certain colors pop out in black & white photos? For example, I have a picture of myself that I made black and white (thats the easy part) but I want my eye color to pop out. I know certain cameras have this feature, I have a canon a570is and i don't think it has that. So what software can I use to do this? I already have picasa but it only has one focal point to be in color, not two. Any suggestions?