A notable resource on the topic of ordered dithering using arbitrary palettes is Joel Yliluoma’s Arbitrary-Palette Positional Dithering Algorithm. One key difference of Yliluoma’s approach is in the use of error metrics beyond the minimisation of . Yliluoma notes that the perceptual or psychovisual quality of the dither must be taken into account in addition to its mathematical accuracy. This is determined by use of some cost function which considers the relationship between a set of candidate colours. The number of candidates, the particular cost function, and the thoroughness of the selection process itself give rise to a number of possible implementations, each offering varying degrees of quality and time complexity.
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This was a rout of the Six Nations favourites, an absolute rout. The scoreline, outlandish though it may seem from the championship’s serial underachievers, in no way flatters Scotland. Indeed, it might be said to underestimate how comprehensive this win was. Scotland’s regret will be to have conceded four tries in the last 15 minutes. That denies Scotland top-of-the-table status going into the final round. France remain on course, just about. Their bonus point, ending up with six tries out of the game’s 13, keeps them ahead of Scotland on points difference. Such is that margin, the title remains France’s to lose.