This how to will teach you how to single out one color with Adobe's Photoshop CS5. This technique will work with other versions of PS as well. With this trick, you'll be able to create some fantastic effects, make colors pop, or simply highlight something you want to show off. It's not hard to do, and a useful things to know if you're planning on putting your Photoshop skills to use in a professional manner. Now you can remove all but one color in Photoshop.