A procedural database for calling internal GIMP functions from external programs, such as Script-Fu

Full Alpha channel support for working with transparency

Features and Capabilities The following list is a short overview of some of the features and capabilities which GIMP offers you: A full suite of painting tools including brushes, a pencil, an airbrush, cloning, etc. Tile-based memory management, so image size is limited only by available disk space Sub-pixel sampling for all paint tools for high-quality anti-aliasing Full Alpha channel support for working with transparency Layers and channels A procedural database for calling internal GIMP functions from external programs, such as Script-Fu Advanced scripting capabilities Multiple undo/redo (limited only by disk space) Transformation tools including rotate, scale, shear and flip Support for a wide range of file formats, including GIF, JPEG, PNG, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others Selection tools, including rectangle, ellipse, free, fuzzy, bezier and intelligent scissors Plug-ins that allow for the easy addition of new file formats and new effect filters.

set up a drawing tablet (I'm using a Wacom tablet) in the latest version of GIMP