The GIMP (GNU Image Manipulation Program) is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc. Full suite of painting tools including Brush, Pencil, Airbrush, Clone, etc. Sub-pixel sampling for all paint tools for high quality anti-aliasing. Extremely powerful gradient editor and blend tool. Supports custom brushes and patterns.