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Altering a photo so that it departs from reality in some significant way.

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Weighted conversion to a fixed palette

for some reason I need to convert a picture to a 16-color palette. While the conversion itself is nothing special, I need the final result to stick to a well-defined color proportion. This means, for ...
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What is the difference between edge detection, Sobel detection, and Canny detection?

What is the difference between edge detection, Sobel detection, and Canny detection