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 :
// 易错点3：升序排序 → 逻辑完全错误（无法保证"后车不超车"的前提）
。safew官方版本下载对此有专业解读
William Harwood
"One of the challenges is marrying that really high-technology, high-innovation space with the realities of food production," Everstine comments. It's just not practical to test everything.
This put me in mind of a recent New Yorker article by the anthropologist Manvir Singh. The article is about the efforts of linguists and folklorists to reconstruct the Proto-Indo-European mythology which links folk tales and gods from India to Ireland. The serpent-slaying storm god, the Sky Father, the Divine Twins: these figures mutated and multiplied across cultures but retained their essential forms.