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From: Michael Koch <astroelectronic@t-online.de>
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Date: Wed, 10 May 2023 14:50:17 +0200
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Subject: Re: [FFmpeg-devel] [PATCH] avfilter: add zoneplate video source
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Well, I can't see how it looks now, but the sequence white - gray - 
white (which is impossible in a sine wave) should no longer be there, 
because cos(x) = cos(-x).
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