Re:AV1@Scale: Film Grain Synthesis, The Awakening
by dinfinity on Thursday July 03, 2025 @02:31PM
(#44457913)
> As for your eyes, I am pretty sure that they have grain
And lots of it, actually. Just close your eyes or look at any non-textured surface. Tons of noise.
The decreasing signal-to-noise ratio is also highly noticeable when it gets darker.
Re:AV1@Scale: Film Grain Synthesis, The Awakening
by plastic3169 on Thursday July 03, 2025 @02:10PM
(#44457731)
Video signal without the noise or grain is annoying to watch as it makes everything in the ”out of focus” zone look smooth blurry. Your eyes want to focus yet it is an illusion of depth without an actual depth. Noise texture emphasizes that this is just a 2D plane after all so your eyes can rest and the viewer doesn’t feel like they need glasses. This is just my theory of it based on observation. No research behind it.
I don't know the psychovisuals behind that. Maybe it adds some high frequencies that compression often washes out, or maybe acts like some kind of dithering.
As for your eyes, I am pretty sure that they have grain, that's how quantum physics work, you just don't perceive it because your brain filters it out. But again, I don't know how it interacts with film grain.