first, make sure you have both the png and plist files in the same directory, in my case: freeGifts.plist and freeGifts.png

second, save the following script as unpack_plist.py

then, python unpack_plist.py freeGifts, it will generate lots of png files to a directory named freeGifts

requirement: python, PIL

#! /usr/lical/bin/python
import os,Image,sys
from xml.etree import ElementTree

def tree_to_dict(tree):
    d = {}
    for index, item in enumerate(tree):
        if item.tag == 'key':
            if tree[index+1].tag == 'string':
                d[item.text] = tree[index + 1].text
            elif tree[index + 1].tag == 'true':
                d[item.text] = True
            elif tree[index + 1].tag == 'false':
                d[item.text] = False
            elif tree[index+1].tag == 'dict':
                d[item.text] = tree_to_dict(tree[index+1])
    return d

def gen_png_from_plist(plist_filename, png_filename):
    file_path = plist_filename.replace('.plist', '')
    big_image = Image.open(png_filename)
    root = ElementTree.fromstring(open(plist_filename, 'r').read())
    plist_dict = tree_to_dict(root[0])
    to_list = lambda x: x.replace('{','').replace('}','').split(',')
    for k,v in plist_dict['frames'].items():
        rectlist = to_list(v['frame'])
        width = int( rectlist[3] if v['rotated'] else rectlist[2] )
        height = int( rectlist[2] if v['rotated'] else rectlist[3] )
        box=( 
            int(rectlist[0]),
            int(rectlist[1]),
            int(rectlist[0]) + width,
            int(rectlist[1]) + height,
            )
        sizelist = [ int(x) for x in to_list(v['sourceSize'])]
        rect_on_big = big_image.crop(box)
        result_image = Image.new('RGBA', sizelist, (0,0,0,0))
        result_box=(
            ( sizelist[0] - width )/2,
            ( sizelist[1] - height )/2,
            ( sizelist[0] + width )/2,
            ( sizelist[1] + height )/2
            )
        result_image.paste(rect_on_big, result_box, mask=0)
        if v['rotated']:
            result_image = result_image.rotate(90)
        if not os.path.isdir(file_path):
            os.mkdir(file_path)
        outfile = (file_path+'/' + k).replace('gift_', '')
        print outfile, "generated"
        result_image.save(outfile)

if __name__ == '__main__':
    filename = sys.argv[1]
    plist_filename = filename + '.plist'
    png_filename = filename + '.png'
    if (os.path.exists(plist_filename) and os.path.exists(png_filename)):
        gen_png_from_plist( plist_filename, png_filename )
    else:
        print "make sure you have boith plist and png files in the same directory"

原文：http://stackoverflow.com/questions/6086615/how-can-i-extract-png-images-from-plist-files