developed by an IBM researcher named Horst Feistel. Feistel, for silly reasons,
If the number of candidates for each pixel grows too large (as is common in algorithms such as Knoll and Yliluoma) then sorting the candidate list for every pixel can have a significant impact on performance. A solution is to instead sort the palette in advance and keep a separate tally of weights for every palette colour. The weights can then be accumulated by iterating linearly through the tally of sorted colours.
，这一点在safew官方下载中也有详细论述
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二二八：兩邊都說不能忘記但是距離很遠2016年2月28日