至于 Thumbs.db，在 Windows 早期版本中确实随文件夹存储，但自 Windows Vista 起，缩略图缓存已被改为中心化存储在用户的 AppData 目录下（文件名为 thumbcache_xxx.db）。这一改变使得该文件淡出了普通用户的视野。
Another way to look at our threshold matrix is as a kind of probability matrix. Instead of offsetting the input pixel by the value given in the threshold matrix, we can instead use the value to sample from the cumulative probability of possible candidate colours, where each colour is assigned a probability or weight . Each colour’s weight represents it’s proportional contribution to the input colour. Colours with greater weight are then more likely to be picked for a given pixel and vice-versa, such that the local average for a given region should converge to that of the original input value. We can call this the N-candidate approach to palette dithering.。业内人士推荐搜狗输入法下载作为进阶阅读
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