Converting iPhone iOS '.cpbitmap' images to PNGs

convert_cpbitmap

#!/usr/bin/python
from PIL import Image,ImageOps
import struct
import sys
if len(sys.argv) < 3:
    print "Need two args: source_filename and result_filename\n";
    sys.exit(0)
filename = sys.argv[1]
result_filename = sys.argv[2]

with open(filename) as f:
    contents = f.read()
    unk1, width, height, unk2, unk3, unk4 = struct.unpack('<6i', contents[-24:])
    im = Image.frombytes('RGBA', (width,height), contents, 'raw', 'RGBA', 0, 1)
    r,g,b,a = im.split()
    im = Image.merge('RGBA', (b,g,r,a))
    im.save(result_filename)

A browser based version I created based off of that Node.js Stack Overflow answer. It works in all modern browsers and should work with all versions of iOS so far: https://cpbitmap.github.io/