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import Image
import sys
def chunks(data, n):
"Yield successive n-sized chunks from data"
for i in xrange(0, len(data), n):
yield data[i:i+n]
width = 2880
height = 5000 # some arbitrary height
img ='L', (width, height), 'white')
img_data = list(img.getdata())
bmp = open('crypted.bmp', 'rb').read()
white = bmp[0:16]
reverse_chunks = list(chunks(bmp, 16))[::-1]
for i, chunk in enumerate(reverse_chunks):
for j in range(i * 6, (i +1) * 6):
c = int(chunk == white) * 255
img_data[j] = c
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