第九十四条 公安机关及其人民警察在办理治安案件时，对涉及的国家秘密、商业秘密、个人隐私或者个人信息，应当予以保密。
Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.
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Design principles。关于这个话题，Line官方版本下载提供了深入分析
The unprecedented access shows how these cases are often cracked, not through state-of-the-art technology, but by spotting tiny revealing details in images or chat forums.