An R3G3B2 palette for GIMP, and how to use it.

Part of this answer to a Stack Overflow question by s.gang.

Here’s a GIMP palette file for R3G3B2 pixel packing of RGB images into one byte per pixel.

  1. Copy the below block into a file called “r3g3b2.gpl” somewhere convenient on your disk.
  2. In the GIMP Palettes panel, right-click and select “Import Palette.”  Choose the “Palette File” option and navigate to r3g3b2.gpl: GIMP "Import Palette" example
  3. Open your image as Indexed.
  4. Select the Colors menu | Map | Set Colormap…
  5. Click the palette-name button and then choose “r3g3b2”:Set the colormap of a GIMP indexed image from a palette
  6. Hit Close, then OK, and you should have color!

Note: R3G3B2 is a very low-color-resolution format, so the image will probably look terrible.

r3g3b2.gpl

GIMP Palette
Name: R3G3B2
#
 0 0 0
 0 0 85
 0 0 170
 0 0 255
 0 36 0
 0 36 85
 0 36 170
 0 36 255
 0 72 0
 0 72 85
 0 72 170
 0 72 255
 0 109 0
 0 109 85
 0 109 170
 0 109 255
 0 145 0
 0 145 85
 0 145 170
 0 145 255
 0 182 0
 0 182 85
 0 182 170
 0 182 255
 0 218 0
 0 218 85
 0 218 170
 0 218 255
 0 255 0
 0 255 85
 0 255 170
 0 255 255
 36 0 0
 36 0 85
 36 0 170
 36 0 255
 36 36 0
 36 36 85
 36 36 170
 36 36 255
 36 72 0
 36 72 85
 36 72 170
 36 72 255
 36 109 0
 36 109 85
 36 109 170
 36 109 255
 36 145 0
 36 145 85
 36 145 170
 36 145 255
 36 182 0
 36 182 85
 36 182 170
 36 182 255
 36 218 0
 36 218 85
 36 218 170
 36 218 255
 36 255 0
 36 255 85
 36 255 170
 36 255 255
 72 0 0
 72 0 85
 72 0 170
 72 0 255
 72 36 0
 72 36 85
 72 36 170
 72 36 255
 72 72 0
 72 72 85
 72 72 170
 72 72 255
 72 109 0
 72 109 85
 72 109 170
 72 109 255
 72 145 0
 72 145 85
 72 145 170
 72 145 255
 72 182 0
 72 182 85
 72 182 170
 72 182 255
 72 218 0
 72 218 85
 72 218 170
 72 218 255
 72 255 0
 72 255 85
 72 255 170
 72 255 255
109 0 0
109 0 85
109 0 170
109 0 255
109 36 0
109 36 85
109 36 170
109 36 255
109 72 0
109 72 85
109 72 170
109 72 255
109 109 0
109 109 85
109 109 170
109 109 255
109 145 0
109 145 85
109 145 170
109 145 255
109 182 0
109 182 85
109 182 170
109 182 255
109 218 0
109 218 85
109 218 170
109 218 255
109 255 0
109 255 85
109 255 170
109 255 255
145 0 0
145 0 85
145 0 170
145 0 255
145 36 0
145 36 85
145 36 170
145 36 255
145 72 0
145 72 85
145 72 170
145 72 255
145 109 0
145 109 85
145 109 170
145 109 255
145 145 0
145 145 85
145 145 170
145 145 255
145 182 0
145 182 85
145 182 170
145 182 255
145 218 0
145 218 85
145 218 170
145 218 255
145 255 0
145 255 85
145 255 170
145 255 255
182 0 0
182 0 85
182 0 170
182 0 255
182 36 0
182 36 85
182 36 170
182 36 255
182 72 0
182 72 85
182 72 170
182 72 255
182 109 0
182 109 85
182 109 170
182 109 255
182 145 0
182 145 85
182 145 170
182 145 255
182 182 0
182 182 85
182 182 170
182 182 255
182 218 0
182 218 85
182 218 170
182 218 255
182 255 0
182 255 85
182 255 170
182 255 255
218 0 0
218 0 85
218 0 170
218 0 255
218 36 0
218 36 85
218 36 170
218 36 255
218 72 0
218 72 85
218 72 170
218 72 255
218 109 0
218 109 85
218 109 170
218 109 255
218 145 0
218 145 85
218 145 170
218 145 255
218 182 0
218 182 85
218 182 170
218 182 255
218 218 0
218 218 85
218 218 170
218 218 255
218 255 0
218 255 85
218 255 170
218 255 255
255 0 0
255 0 85
255 0 170
255 0 255
255 36 0
255 36 85
255 36 170
255 36 255
255 72 0
255 72 85
255 72 170
255 72 255
255 109 0
255 109 85
255 109 170
255 109 255
255 145 0
255 145 85
255 145 170
255 145 255
255 182 0
255 182 85
255 182 170
255 182 255
255 218 0
255 218 85
255 218 170
255 218 255
255 255 0
255 255 85
255 255 170
255 255 255

makepal.py

This is the Python script I used to generate r3g3b2.gpl.

#!/usr/bin/python3
# makepal.py: Copyright (c) 2016 cxw. CC-BY.

print("""\
GIMP Palette
Name: R3G3B2
#""")

# Print an R3G3B2 palette
for red in [int(x*255.0/7) for x in range(8)]:
    for green in [int(x*255.0/7) for x in range(8)]:
        for blue in [int(x*255.0/3) for x in range(4)]:
            print("%3d %3d %3d"%(red, green, blue))

# vi: set ts=4 sts=4 sw=4 et ai: #

 

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