unpack png from atlas images (such as flappy bird)

unpack_atlas.py

#/usr/local/bin/python
import os, sys, math
from PIL import Image

def config_to_dict(atlas_entry):
	d = {}
	list = atlas_entry.split(" ")
	d["frameName"] = list[0]
	d["width"] = int(list[1])
	d["height"] = int(list[2])
	d["x"] = math.floor(1024 * float(list[3]) + 0.1)
	d["y"] = math.floor(1024 * float(list[4]) + 0.1)
	return d

def gen_png_from_atlas(config_filename, png_filename):
	file_path = png_filename.replace('.png', '')
	big_image = Image.open(png_filename)
	config_file = open(config_filename, 'r')
	for line in config_file:
		config_dict = config_to_dict(line)
		box = (
				int(config_dict["x"]),
				int(config_dict["y"]),
				int(config_dict["x"] + config_dict["width"]),
				int(config_dict["y"] + config_dict["height"]),
				)
		rect_on_big = big_image.crop(box)
		result_size = [config_dict["width"], config_dict["height"]]
		result_box = (0, 0, config_dict["width"], config_dict["height"])
		result_image = Image.new('RGBA', result_size, (0, 0, 0, 0))
		result_image.paste(rect_on_big, result_box, mask=0)
		if not os.path.isdir(file_path):
			os.mkdir(file_path)
		outfile = file_path + '/' + config_dict['frameName'] + '.png'
		print outfile, "generated"
		result_image.save(outfile)

if __name__ == '__main__':
	filename = sys.argv[1]
	config_filename = filename + ".txt"
	png_filename = filename + ".png"
	if (os.path.exists(config_filename) and os.path.exists(png_filename)):
		gen_png_from_atlas(config_filename, png_filename)
	else:
		print "make sure you have both atlas config file and atlas png files in the same directory"

Thanks for this tool but you should have said that usage is >unpack_atlas.py atlas
Also in some game the picture size is 2048, I edited that and it worked like a charm