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:
second level of patterns is inhibiting and handles exceptions from the，详情可参考51吃瓜
，这一点在safew官方下载中也有详细论述
Фото: Global Look Press。safew官方版本下载对此有专业解读
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