* cmyk support
* palette import/export
* load/save pattern as picture
* load/save brush as picture
* color mode rgb to indexed: dithering: using pattern
* color mode rgb to indexed: dithering: halftone screen (angle, lpi)
* color mode rgb to indexed: colours from external palette file
* colormap: add/remove colour
* polygon select
* actions
* ctrl+p defaultly for print (not palettes dialog)
* new channels using custom colours (like pantones, other palettes, rgb value,etc)
* picture format: indexed rgb+alpha format
* picture format: 16bit indexed mode
* picture format: rgb 48bit, rgba 64bit
* hsv colour mode
* cielab colour mode
* cmyk colour mode
* indexed cmyk colour mode
* Color
posterize on indexed mode
* .cin picture format load/save
* .mag picture format load/save (format popular in japan)
* .iff amiga ham6 and ham8 export
* Better indexed mode management (1bit seems to take 8bit memory room)
* txt-based default picture format, like .xpm, with layer and opacity capabilities
* defaultly available filters coded in pythonfu and scriptfu, which help coders on doing their own filters at image processing level
* open from and save to options for Photobucket, Flickr, and Picassa
* Something like this to create harmonic color sets www * colorjack * com / sphere /
* Ftp or some file repository for collection, voting and distribution of user created brushes, gradients, scripts, palettes, etc.
* Batch conversion script for converting large number of files xcf, png, etc to gih brushes.
* 16 & 32 bit imaging tools
* HDR and tone mapping tools
* Support for exr, hdr file formats
* Left-right symmetric drawing mode for drawing symetrical objects like faces.
* Central axis symetrical painting mode like Mandala Painter software.
* Tile design mode like the one described here:
http://www-viz.tamu.edu/faculty/ergun/research/artisticdepiction/papers/multimedia00.pdf
* Support for directional properties of gih burushes in all painting tools (like smudge)
* Paintbrush presets: Saved brush name, brush properties and settings, brush colors in a palette like menu.
* Extras download with lots of brushes gradients, palettes addons...
* Script recorder
* Distort with a grid
* Imagemosaic filter
* Drawing tools like those in Inkscape: Basic shapes Line, spline curves, rounded or cornered (triangles, rectangles, pentagones, hexagones) spiral, petals and stars; with border width and fill color controls.
* Text on path