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antiface/bmp_negator.py

Forked from mcrisc/bmp_negator.py
Created August 6, 2016 14:08
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bmp_negator.py
# coding: utf-8
# Python Bitmap (bmp) Image Negation (using module struct)
import struct
with open('in.bmp', 'rb') as fd, open('out.bmp', 'wb') as out:
s = fd.read(1)
count = 1
while s:
if count < 37: # header bytes
out.write(s)
else: # data bytes
b = struct.unpack('B', s)[0]
out.write(struct.pack('B', 255 - b))
s = fd.read(1)
count += 1
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