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I have a 16x16 bitmap containing 256 pixels of distinct colours that I want to use as a palette for 8-bit indexed mode. Is there a way to convert this bitmap into one that GIMP can use as a custom palette? I also need the order of the colours to be preserved.

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Thanks to xenoid's hint, I was able to get this working with a python script.

from PIL import Image

print "GIMP Palette"
print "Name: my-new-palette"
print "Columns: 16\n#"

bmp = Image.open( "my-palette.bmp" )
bmp_im = bmp.convert('RGB')

for row in range(16):
    for col in range(16):
        r,g,b = bmp_im.getpixel((col, row))
        print "%3d %3d %3d   Index %d" % (r, g, b, 16*row+col)
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  • Open the image,
  • Open the palettes list (Windows>Dockable dialogs>Palettes`)
  • Righ-click any palette on the list
  • Select Import palette...
  • Make adequate choices in the dialog that opens:

enter image description here

Now the palette is pretty much randomly sorted. If the initial bitmap is sorted on some criteria it is possible to re-sort the palette on the same criteria with a script.

A completely different method is to export the image is some easy to process format (possibly text based: C, XMP, HTML) and process that with a script tp generate the Gimp palette (which is ASCII text with a rather trivial format).

  • Hmm, this seems close to what I need, but the colours are randomised. – TheBigH Sep 29 '18 at 20:33
  • 1
    Edited answer... – xenoid Sep 29 '18 at 20:48

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