viscrypt
Simple tool for creating (2,2) visual cryptography schemes. These are described by various authors, first by Naor & Shamir (1994).
I've written this tool because the only other application I found online was a jar.
Usage
python3 viscrypt.py IMAGE_NAME
This will create two images, IMAGE_NAME_share1.png and IMAGE_NAME_share2.png.
Notes
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Pixel expansion is not handled in any way. Therefore the resulting shares will be twice the height of the original image.
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The produced shares have no transparency. Use tools like GIMP to turn the white pixels into transparent pixels.
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Your input image will be converted to black and white (not grayscale!) with dithering. Nevertheless you shouldn't try this with full colored images, their contrast will possibly be to low.
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I've only tested this with Python 3, Python 2 could work though.
License
MIT-License (see the LICENSE file for details).