圖像來源，AFP via Getty Images
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几名刚刚参与枪战的警员一边试图控制局面，一边进行紧急救援，但与此同时，大量路人从四面八方涌入现场。其中一名警员被叫去处理一把掉落在附近的枪支。。关于这个话题，WPS官方版本下载提供了深入分析
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.