png.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from StringIO import StringIO
from io import BytesIO

from PIL import Image


if __name__ == '__main__':
    with open('bad.png') as f:
        bytes = ''.join(f.xreadlines())

    buffer = BytesIO(bytes)
    image = Image.open(buffer)

    if image.mode not in ('L', 'RGB', 'RGBA'):
        image = image.convert('RGB')

    out_file = StringIO()
    image.save(out_file, "PNG")