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68 lines
No EOL
2.3 KiB
Python
68 lines
No EOL
2.3 KiB
Python
#!/usr/bin/env python
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#-*- coding: utf-8 -*-
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# Stéganô - Stéganô is a basic Python Steganography module.
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# Copyright (C) 2010-2011 Cédric Bonhomme - http://cedricbonhomme.org/
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#
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# For more information : http://bitbucket.org/cedricbonhomme/stegano/
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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__author__ = "Cedric Bonhomme"
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__version__ = "$Revision: 0.1 $"
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__date__ = "$Date: 2010/10/01 $"
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__license__ = "GPLv3"
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from PIL import Image
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def steganalyse(img):
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"""
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Steganlysis of the LSB technique.
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"""
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encoded = img.copy()
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width, height = img.size
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bits = ""
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for row in range(height):
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for col in range(width):
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r, g, b = img.getpixel((col, row))
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if r % 2 == 0:
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r = 0
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else:
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r = 255
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if g % 2 == 0:
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g = 0
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else:
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g = 255
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if b % 2 == 0:
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b = 0
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else:
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b = 255
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encoded.putpixel((col, row), (r, g , b))
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return encoded
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if __name__ == '__main__':
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# Point of entry in execution mode.
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from optparse import OptionParser
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parser = OptionParser()
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parser.add_option("-i", "--input", dest="input_image_file",
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help="Image file")
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parser.add_option("-o", "--output", dest="output_image_file",
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help="Image file")
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parser.set_defaults(input_image_file = './pictures/Lenna.png',
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output_image_file = './pictures/Lenna_steganalysed.png')
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(options, args) = parser.parse_args()
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input_image_file = Image.open(options.input_image_file)
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output_image = steganalyse(input_image_file)
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output_image.save(options.output_image_file) |