D 2014-02-02T19:08:09.875 L Dithering P 910102754cd936cc592318d95313f7af6e582947 U user W 478

Dithering

Dithering is the algorithm for preparing of image to black-white printing (old newspapers, old books) or for old displays systems. Here is 2 different implementations: general purpose with using of matrixes defined in imsh.scm library and special dithering algorithms.
Original image:

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Output image for general Sierra:

Z c88707cc4d677f4784181cb4b74c1f42