Watch dramatic rescue of skier buried in deep snowA GoPro camera captures the moment two skiers rescued another skier buried under feet of snow in Lake Tahoe, California.
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:
。关于这个话题，51吃瓜提供了深入分析
Josh Dury said it was a "battle against time" to get the shot
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