slowness, heap allocations. Each time a Go program allocates memory
BPatterns don’t expose every feature of the rewrite engine yet, but many are already supported, including full method patterns via #bmethod.
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You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.