User blog comment:Xean/Slick Skin and Wordmark Tips/@comment-168424-20110728192642

Users of GIMP and Photoshop should try to make sure they put different elements (background color vs. foreground images) on different layers so they can move elements around and change their transparency selectively. This is a very powerful technique and what really separates GIMP and Photoshop from pixel painting tools that don't support images.