This is the easiest masking you will ever do. First we need to apply a mask to our colored layer. We do that by clicking the mask icon at the bottom of the layers palette. Click on the mask that appears on that layer. Your color palettes will turn to black and white, that's because masks work by levels of transparency; the white is 100% opacity, black is totally transparent, shades represent levels between. The first thing we're going to do is take the Paint Bucket and fill our mask with black. Poof! All the color is gone. To get it back, we switch to the color white, grab our paint brush, and draw in the mask window wherever we want color. It's that easy. And viola! We have color exactly where we want it and nowhere else: Doesn't look like much now, but we're getting there.