Gimp plug-in to scale images recursively from a folder

scale_images.py

#! /usr/bin/env python
from gimpfu import *
import glob
from os import listdir
from os.path import isfile, isdir, join, splitext
import os
import sys
import time
import datetime

# print-en irteera fitxategi honetara berbideratuko da, lehenagoko testuari gehituz ('a' -> append)
sys.stdout = open( '/home/josu/gimpstdout.txt', 'a')
# sys.stdout = open( 'd:\\neria\\gimpstdout.txt', 'a')
# sys.stderr = open( 'd:\\neria\\gimpstderr.txt', 'a')

def run(*args):
    ts = time.time()
    st = datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d %H:%M:%S') # 2012-12-15 01:21:05
    dir_name, extension_ind, scale_factor = args

    extension = ('.xcf', '.psd', '.jpg', '.png')[extension_ind]
    print "*** BEGIN *** scale_images"
    print 'args:', dir_name, ',', extension
    print 'date:', st
    out_dir = dir_name + '_scaled'
    if not os.path.exists(out_dir):
        os.mkdir(out_dir)

    scale_images(dir_name, scale_factor, out_dir, extension)

def scale_images(dir, scale_factor, out_dir, extension):
    for file in listdir(dir):
        path = join(dir, file)
        filename, file_extension = os.path.splitext(file)
        if (isdir(path)):
            out_dir_path = join(out_dir, file)
            if not os.path.exists(out_dir_path):
                os.mkdir(out_dir_path)
            scale_images(path, scale_factor, out_dir_path, extension)
        elif file_extension == extension:
            new_filename = out_dir + os.path.sep + filename + '.jpg'
            print 'saving: ', new_filename
            image = pdb.file_jpeg_load(path, path)
            pdb.gimp_image_scale(image, image.width*scale_factor, image.height*scale_factor)
            merged_layer = pdb.gimp_image_merge_visible_layers(image, 2)
            pdb.file_jpeg_save(image, merged_layer, new_filename, "raw_filename", 1, 0.5, 0, 0, image.filename + " erdira eskalatua", 0, 0, 0, 0)
 
register(
    "scale_images", 
    "Irudiak eskalatzeko",
    "Irudiak eskalatzeko",
    "Josu Igoa",
    "Josu Igoa",
    "2016",
    "<Toolbox>/Pluginak/Scale images", "",
    [
        (PF_DIRNAME, "directory", "Directory to find files with the given extension and export them", ""),
        (PF_OPTION, "file_extension", "Extension of the files which will be exported", 0, ('xcf', 'psd', 'jpg', 'png')),
        (PF_FLOAT, "scale_factor", "The scale factor", "0.5"),
    ],
    [],
    run
    )
 
main()