In this tutorial, I show you a quick trick I use to clean up the edges of white renders. I often use these white renders on my websites, and having anything other than white on the edge will show the seam. It's a simple trick using levels, but it helps you find any pixels that aren't pure white and paint them out. I was using this this morning and thought it may be helpful to make a quick video. Hope it helps.
See the full tutorial here: greyscalegorilla.com/blog/?p=13008