Why scientists fear Emperor penguins' annual moult may be killing them

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This time, before we perturb the input image, we take the value given by the threshold matrix and divide it by , where is the number of levels for each colour component. As a result, each pixel is perturbed just enough to cover the minimal distance between two colours in the palette. Since the entire palette is evenly distributed across colour space, we only need to modify the range of perturbation along each axis. The dithering equation then becomes:,这一点在快连下载安装中也有详细论述

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By the early 1960s, with ERMA on the scene, IBM's started to catch up.