Calling gimp_image_convert_indexed with a custom palette, palette cant be found

I am making a script to limit any image into 3 colors (to be used in a program to display to an e-ink display). I want to do this using GIMP’s gimp_image_convert_indexed function bc Wand and PIP’s .quantize don’t work how I want them to and don’t look as good. This is on a headless raspi zero.

When I call the script using gimp -idf --batch-interpreter python-fu-eval -b 'import sys;sys.path=["."]+sys.path;import colorindex;colorindex.python_colorindex("gimptemp.jpg")' -b 'pdb.gimp_quit(1)' it gives me the error:

GIMP-Error: Calling error for procedure 'gimp-image-convert-indexed':
Palette 'E-Ink' not found

Traceback (most recent call last):
  File "/usr/lib/gimp/2.0/python/gimpfu.py", line 827, in _run
    return apply(func, params[1:])
  File "/usr/lib/gimp/2.0/plug-ins/python-eval/python-eval.py", line 25, in code_eval
    exec code in globals()
  File "<string>", line 1, in <module>
  File "./colorindex.py", line 7, in python_colorindex
    pdb.gimp_image_convert_indexed(image, 1, 4, 3, FALSE, FALSE, "E-Ink")
RuntimeError: Palette 'E-Ink' not found
batch command experienced an execution error
gimp: GEGL-WARNING: (gegl-tile-handler-cache.c:977):gegl_tile_cache_destroy: runtime check failed: (g_queue_is_empty (&cache_queue))
EEEEeEeek! 2 GeglBuffers leaked

The custom palette is in GIMP’s palette folder (it’s even recognized when I open palettes through the UI) and for safe measure I put a copy of the palette in the directory the script is running from. I tried setting the name of the file and the name of the palette to “eink” rather than “E-Ink” and it had the same error. Same thing happened when I specified the filepath (“/home/pi/.config/GIMP/2.10/palettes/E-Ink.gpl”) instead of “E-Ink”.

Here is colorindex.py (the gimp script)

import os
from gimpfu import *
def python_colorindex(file):
    os.system("echo gimp")
    image = pdb.gimp_file_load(file, file, run_mode=RUN_NONINTERACTIVE)
    drawable = pdb.gimp_image_get_active_layer(image)
    pdb.gimp_image_convert_indexed(image, 1, 4, 3, FALSE, FALSE, "E-Ink")
    os.system("echo processed image")
    pdb.gimp_file_save(image, drawable, file, file)
    pdb.gimp_image_delete(image)
    print("Exit")

Here is showing the error and the paths to the palette

Here is showing gimp recognizing the palette (running on the same machine but GUI through Xming)

Answer

On your command line you’ve specified the -d option that tells GIMP not to load any data: i.e. “Do not load brushes, gradients, palettes, patterns, …” so your script won’t have your palette loaded.

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Answer