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Adobe Systems Incorporated is in possession of US Patent number 6606166, applied for on 1999-04-30, granted on 2003-08-12, but which expired on 2019-11-16. It describes an algorithm called pattern dithering invented by Thomas Knoll. For the sake of documentation, we will explain how that algorithm works as well.
In the patented form of pattern dithering, the threshold matrix is strictly restricted to 16 values (4x4 Bayer matrix), although there is no reason why no other size of matrix can be used. In this article, we will continue to use the 8x8 size so as to not infringe on the patent¹.ключевое слово "объясним", а не скопируем как в фотошопе
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