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)

Converting iPhone iOS '.cpbitmap' images to PNGs

See https://stackoverflow.com/a/44225159/5219886

It doesn't work for wallpaper in iOS 12, because every line has an offset on the basis of 16 bytes.

See the same stack overflow thread, but on the lower part - the JS solution.
https://stackoverflow.com/questions/7998324/dot-cpbitmap-images-imgaename-cpbitmap

My code works for the backup of iOS 12

from PIL import Image
import sys
import math
import struct

def r8(f):
    c = ord(f.read(1))
    return c

if len(sys.argv) <= 2:
    print("Usage: %s <input> <output>" % sys.argv[0])
else:
    f = open(sys.argv[1], "rb")
    f.seek(-78, 2)
    magic = f.read(8)
    print magic
    if magic != "bplist00":
        print("Didn't find bplist header, are you sure this is a cpbitmap file?")
        exit(1)
    f.seek(50, 1)
    dat = f.read(6)
    width, height = struct.unpack("<HxxH", dat)
    print("Size: %dx%d" % (width, height))
    img = Image.new("RGBA", (width, height))

    f.seek(0)
    imgd = img.load()

    # Take case of the line size
    line_size = int(math.ceil(width/16.0) * 16)
    print line_size
    for y in range(height):
        for x in range(width):
            b, g, r, a = r8(f), r8(f), r8(f), r8(f)
            imgd[x, y] = (r, g, b, a)
        f.seek((line_size - width)*4, 1)

    f.close()
    img.save(sys.argv[2])

@sh00tg0a1 not working with this message:

import: delegate library support not built-in '' (X11) @ error/import.c/ImportImageCommand/1282.
./cpbitmap.py: line 6: syntax error near unexpected token `('
./cpbitmap.py: line 6: `def r8(f):'

Looks like iOS 13 broke all of these.

Also needs to be converted to python3/PIL7. Thankfully I have a iOS12 backup still and gentoo gives me every python/PIL combo I could ever want.

@donly @weedy
I have updated the code. It is compatible with python3/PIL now. You can find the code here
.

@sh00tg0a1 Thanks

NodeJS version https://github.com/hthetiot/cpbitmap-to-png/blob/main/README.md

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/