<?php $ndiv = 5; // small => less colors ; big => more colors $div = 255 / $ndiv; $mapping = []; for ($r = 0; $r <= 255; $r += $div) { for ($g = 0; $g <= 255; $g += $div) { for ($b = 0; $b <= 255; $b += $div) { $mapping[] = sprintf("%d,%d,%d", $r, $g, $b); } } } print_r($mapping);
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