The N-closest or N-best dithering algorithm is a straightforward solution to the N-candidate problem. As the name suggests, the set of candidates is given by the closest palette colours to the input pixel. To determine their weights, we simply take the inverse of the distance to the input pixel. This is essentially the inverse distance weighting (IDW) method for multivariate interpolation, also known as Shepard’s method. The following pseudocode sketches out a possible implementation:
Вячеслав Агапов
，这一点在Safew下载中也有详细论述
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Олег Давыдов (Редактор отдела «Интернет и СМИ»)，详情可参考一键获取谷歌浏览器下载