Split sprite to separate images

desprite.py

#!/usr/bin/env python

import Image
import argparse
import os

def main(filename, width, height, skip_width, skip_height):
    cur_x = 0
    cur_y = 0

    outfile, outext = os.path.splitext(filename)
    
    sprite = Image.open(filename)

    img_width, img_height = sprite.size
    tile_region = (0, 0, width, height)
    
    i = 0

    while cur_y + height <= img_height:
        cur_x = 0
        while cur_x + width <= img_width:
            i+=1
            tile_output = outfile + '-' + str(i) + outext

            tile = Image.new('RGBA', (width, height))
            box = (cur_x, cur_y, cur_x + width, cur_y + height)
            region = sprite.crop(box)
            tile.paste(region, tile_region)
            tile.save(tile_output)

            cur_x += width + skip_width
            
        cur_y += height + skip_height

    print "%d tile(s) successfully extracted" % (i)
    
if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description="Split sprite to separate images",
        version="0.1"
    )
    parser.add_argument('filename', help="input file")
    parser.add_argument('width', help="width of tile", type=int)
    parser.add_argument('height', help="height of tile", type=int)
    parser.add_argument('skip_width', nargs='?', type=int, default=0,
                        help="horizontal space between tiles (default: %(default)s)")
    parser.add_argument('skip_height', nargs='?', type=int, default=0,
                        help="vertical space between tiles (default: %(default)s)")
    
    args = parser.parse_args()
    main(args.filename, args.width, args.height, args.skip_width, args.skip_height)