README.md

Challenge:

Nalezněte tajnou zprávu špiona-zelenáče. 50_odstinu_flagu.png.gz

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Solution:

#!/usr/bin/env python3

from PIL import Image

tuples = []

with Image.open('50_odstinu_flagu.png', 'r') as img:
    for p in list(img.getdata()):
        if p[0] is 127:
            tuples.append((255, 255, 255))
        else:
            tuples.append((0, 0, 0))

    with Image.new('RGB', img.size) as im:
        im.putdata(tuples)
        im.save('flag.png')

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FLAG:

flag{George_Boole-7064}