美国二手书零售商 Better World Books,以及总部位于英国的 World of Books,每次采购动辄数万册。内部文件还显示,员工曾讨论接洽纽约公共图书馆,甚至提到可以找某家长期资金不足的新图书馆。
Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.
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