Notice the split: the first four axioms — atom, eq, car, cdr — are pure data operations, living entirely in lisp.h. cons crosses into memory management. Only quote and cond require the evaluator — they are the boundary where data becomes behavior.
This time, before we perturb the input image, we take the value given by the threshold matrix and divide it by , where is the number of levels for each colour component. As a result, each pixel is perturbed just enough to cover the minimal distance between two colours in the palette. Since the entire palette is evenly distributed across colour space, we only need to modify the range of perturbation along each axis. The dithering equation then becomes:，这一点在whatsapp网页版中也有详细论述
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