<h1>Dithering</h1>

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.
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Original image:<br/>
<img width="30%"/>
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Output image for general Sierra:<br/>
<img width="30%"/>
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