Any time you’re creating a collage, you’ll eventually add an image that has little white pixels around the edges of your object. Here’s a tip for getting rid of that “fringe.” Go under the Layer menu, under Matting, and choose Defringe. Try the default setting of 1 pixel and click OK. What this does (here’s the techno speak) is replace the edge pixels with a combination of the pixel colors in your object and the colors in the background (whew, that hurt). That usually does the trick. If it doesn’t, Undo it, then try a 2- or 3-pixel Defringe.