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Old 15th November 2019, 20:51   #7203  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,750
Quote:
Originally Posted by foxyshadis View Post
How is that any different from physical film grain on actual film stock? That x264 and x265 completely neglected it because it was hard to test doesn't mean a little noise generation isn't valuable.
The grain generation is often done in wrong ways that make it much harder to encode than real world grain. I especially see this in 4K and HDR, where grain gets rendered at the pixel level with SDR code values and so comes out way too bright and too fine-grained. I've seen synthetic film grain that made content impossible to encode at even vaguely acceptable quality at 40 Mbps.

We're also seeing silly amounts of film grain in restored rescans of movies. It isn't creative intent to preserve all kinds of noise that wouldn't have been visible on the perf screens and foot lamberts that the creatives actually approved the content on.
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