Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :
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。。Line官方版本下载是该领域的重要参考
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