GIMP

[Leo Glynn <glynn@example.com>]

Here is what gimp is (took it off the home Page)
I had problems with 16bpp
URL http://www.XCF.Berkeley.EDU/~gimp/gimp.html

regards
leo
glynn@example.com

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The GIMP is our answer to the current lack of free (or at least reasonably priced) image manipulation software for Linux and UNIX in general. 

                              - Peter Mattis, Spencer Kimball 

The GIMP's functionality includes: 

      Support for 8, 15, 16, & 24 bit displays 
      Ordered and Floyd-Steinberg Dithering for 8 bit 
      RGB, Grayscale, & Indexed color modes 
      Multiple views of same image to ease complex tasks 
      Fast zooming and panning on images 
      Full suite of selection tools - (rectangle, ellipse, freehand, fuzzy, bezier, intelligent) 
      Transform tools - (rotate, scale, shear, flip) 
      Crop, color picker, bucket-fill, blend, & text tools 
      Paint tools - (paintbrush, airbrush, clone, blur, sharpen, convolve) 
      Full set of brush masks and support for arbitrary brushes 
      File format support - (jpg, tif, gif, png, xpm) 
      Numerous effects filters - (blur, edge detect, pixelize, ...) 
      Channel operations - (add, composite, blend, ...)