mirror of
https://github.com/cedricbonhomme/Stegano.git
synced 2025-05-12 17:18:30 +02:00
50 lines
No EOL
1.4 KiB
Python
50 lines
No EOL
1.4 KiB
Python
#! /usr/local/bin/python
|
|
#-*- coding: utf-8 -*-
|
|
|
|
__author__ = "Cedric Bonhomme"
|
|
__version__ = "$Revision: 0.1 $"
|
|
__date__ = "$Date: 2010/10/01 $"
|
|
__license__ = "GPLv3"
|
|
|
|
from PIL import Image
|
|
|
|
def steganalyse(img):
|
|
"""
|
|
Steganlysis of the LSB technique.
|
|
"""
|
|
encoded = img.copy()
|
|
width, height = img.size
|
|
bits = ""
|
|
for row in range(height):
|
|
for col in range(width):
|
|
r, g, b = img.getpixel((col, row))
|
|
if r % 2 == 0:
|
|
r = 0
|
|
else:
|
|
r = 255
|
|
if g % 2 == 0:
|
|
g = 0
|
|
else:
|
|
g = 255
|
|
if b % 2 == 0:
|
|
b = 0
|
|
else:
|
|
b = 255
|
|
encoded.putpixel((col, row), (r, g , b))
|
|
return encoded
|
|
|
|
if __name__ == '__main__':
|
|
# Point of entry in execution mode
|
|
from optparse import OptionParser
|
|
parser = OptionParser()
|
|
parser.add_option("-i", "--input", dest="input_image_file",
|
|
help="Image file")
|
|
parser.add_option("-o", "--output", dest="output_image_file",
|
|
help="Image file")
|
|
parser.set_defaults(input_image_file = './pictures/Lenna.png',
|
|
output_image_file = './pictures/Lenna_steganalysed.png')
|
|
(options, args) = parser.parse_args()
|
|
|
|
input_image_file = Image.open(options.input_image_file)
|
|
output_image = steganalyse(input_image_file)
|
|
output_image.save(options.output_image_file) |