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40 lines
1023 B
40 lines
1023 B
#!/usr/bin/env python3
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"""Extract LSB plans for either RGB or the greyscale value. Requires Pillow."""
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import sys
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import PIL.Image
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def main():
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img = PIL.Image.open(sys.argv[1])
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if img.mode == "L":
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print("Dumping grayscale LSB.")
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dump_monochannel(img)
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else:
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print("Dumping RGB LSB.")
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dump_rgb(img)
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def dump_monochannel(img):
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width, height = img.size
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out = PIL.Image.new('1', (width, height))
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for x in range(width):
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for y in range(height):
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op = img.getpixel((x, y))
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p = 1 if op & 1 else 0
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out.putpixel((x, y), p)
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out.save("lsb.png")
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def dump_rgb(img):
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width, height = img.size
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for i in range(3):
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out = PIL.Image.new('1', (width, height))
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for x in range(width):
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for y in range(height):
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op = img.getpixel((x, y))
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p = 1 if op[i] & 1 else 0
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out.putpixel((x, y), p)
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out.save(f"lsb{i}.png")
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if __name__ == "__main__":
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main()
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