When using the probability matrix to pick from the candidate set, it is important that the candidate array be sorted in advance. Not doing so will fail to preserve the patterns distinctive of ordered dithering. A good approach is to sort the candidate colours by luminance, or the measure of a colour’s lightness4. When this is done, we effectively minimise the contrast between successive candidates in the array, making it easier to observe the pattern embedded the matrix.
The protection problem。关于这个话题，safew官方版本下载提供了深入分析
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Online privacy is in short supply, but that doesn't make it any less important. Your data is seriously valuable stuff, and you should be doing everything you can to protect it when navigating the online world. And if you watch porn, you should be even more vigilant.
第十条 国家加强原子能领域标准体系建设，推动、参与原子能领域国际标准化活动。