a gimp plugin (python-fu)

indexDecolor.py

# -*- coding: utf-8 -*-

from gimpfu import *
import os
import glob  # unused

colorpalette = []

def decolorFiles(dirname, ext, suffix):
    """
        Convert Non-Indexed Image to Indexed Image. 
    """

    topdir = os.walk(dirname)

    if suffix.find(ext) < 0:
        suffix = suffix + ext

    while 1:
        try:
            pwd, dirs, files = next(topdir)
            
            os.chdir(pwd)

            for f in files:
                
                if f.endswith(ext):
                    abspath = os.path.abspath(f)
                    filename = f.split(ext)[0]
                    new_filename = filename + suffix
                    new_filename_path = os.path.join( os.path.dirname(abspath),
                                            new_filename)

                    img = pdb.gimp_file_load(abspath, "")
                    drawable = pdb.gimp_image_get_active_layer(img)
                    pdb.gimp_image_convert_indexed(img, NO_DITHER, MAKE_PALETTE, 255, False, True, "")
                    #pdb.gimp_image_convert_indexed(img, NO_DITHER, CUSTOM_PALETTE, 255, False, True, colorpalette)

                    pdb.gimp_file_save(img, drawable, new_filename_path, "")

        except StopIteration, e:
            break

register(
    "indexDecolor_batch",                      # name of procedure
    "convert to indexed png batch procedure",
                                             # description of procedure
    "",                                      # information appending to pdb
    "jf",                                      # author
    "",                                      # lisence
    "2011",                                  # create date
    "IndexDeColor",                          # name in menu
    "",                                      # image type of procedure
    [(PF_DIRNAME, "directory", "root directory of images for process", ""),
     (PF_STRING,  "extension", "image type", ".png"),
     (PF_STRING,  "suffix", "processed image suffix", "_indexed.png")], 
                                             # argument definition
    [],                                      # return value definition
    decolorFiles,                            # procedure
    menu="<Toolbox>/Xtns/MySample",)         # register into 

main()