Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.
Фото: Mindaugas Kulbis / AP
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"These deals mostly increase Reddit's visibility and strategic importance, rather than being the original reason people use it," says Oc.，这一点在safew官方下载中也有详细论述
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