CinePaint is a free open source painting and image retouching program designed to work best with 35mm film and other high resolution high dynamic range images. It is the most popular open source tool in the motion picture industry -- used in 2 Fast 2 Furious, Scooby-Doo, Harry Potter, Stuart Little and other feature films. CinePaint is used for painting of background mattes and for frame-by-frame retouching of movies. WWW: http://www.cinepaint.org/