The Interface preferences deal with the “look” of Photoshop CS6. You can change these so that you can use Photoshop in a way that is easiest for you. Here’s the scoop:Screen Modes: In the Color Theme settings, you can choose from four shades of gray for your overall UI. You can also select the color of the background around your image for each screen mode. Finally, you can also select whether your image edge is surrounded by a line, drop shadow, or nothing at all.