decode.py

from PIL import Image
import sys

datas = []
for name in range(3):
    im = Image.open("imgs/img-%d.png" % name)
    data = im.getdata()
    bits = []
    for i in range(26):
        for j in range(16):
            bits.append(data[64*64*16*i+64*j]/255)

    bytes = []
    for i in range(26*2):
        c = 0
        for j in range(8):
            c *= 2
            c += bits[i*8+j]
        bytes.append(c)

    datas.append(bytes)

print "".join(chr(c^d) for c, d in zip(datas[0], datas[2]))
print "".join(chr(c^d) for c, d in zip(datas[1], datas[2]))