From inside GIMP, open the image you wish to play with, go to the "Colors"
https://bugzilla.novell.com/show_bug.cgi?id=375616
User hpj@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=375616#c18
--- Comment #18 from Hans Petter Jansson 2008-04-22 00:18:37 MST ---
Created an attachment (id=209489)
--> (https://bugzilla.novell.com/attachment.cgi?id=209489)
color-reduction.c
A GEGL operation that can do color reduction to a specific number of bits per
channel (channels and alpha are adjustable individually - for "hicolor", choose
565* for RGBA respectively). It supports a 48-bit colorspace for input and
output, so you can dither 48-bit images down to 24-bit for example (tested and
works).
For color compensation it implements thresholding, Bayer, Floyd-Steinberg,
random and random dithering with co-variant channels.
To use, drop the source file into gegl/operations/common/, compile and
re-install gegl, and run Gimp 2.5 with gegl enabled. The simplest way of doing
this is using jhbuild (Jakub, I assume you know how to do this since you
brought up using GEGL before).
pulldown menu and choose "GEGL Operation...". From the dialog's combo-box,
choose the "color-reduction" plugin.
To see the available color compensation strategies, hover the mouse cursor over
the entry besides the "Dither" label. Since GEGL doesn't seem to support enums,
you have to enter the name of the strategy as a string (default is threshold).
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