Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: pscgi on 2022-04-14, 16:07:26
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Hi guys. I've recently started working on animations and I'm constantly encountering some issues that I need to solve. So one of them is banding.
I'm using 32bit EXRs so it's not a matter of not having enough color data but am I right that banding appears when I have very subtle gradients (eg. a white wall well lit from one side and dark on the other side = subtle gradient) and too strong denoiser? I've done some tests and looks like there's banding when a denoiser amount is 1 but when I lower it to eg. 0.8 it seems to be gone. And denoiser radius is always 1, I have never changed that. I'm trying to find a good balance between noise level limit, denoiser amount and rendering time to have a very good quality but without overpaying for render farms.
So could anyone confirm that for sure it's a matter of very subtle gradients + too strong denoiser just to be sure? Thanks!
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Might be a silly question but is your composition/timeline at least 16bit?
(https://i.ibb.co/16GgKd6/Screenshot-2022-04-14-162325.jpg)
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So could anyone confirm that for sure it's a matter of very subtle gradients + too strong denoiser just to be sure? Thanks!
This sounds like a very likely cause. I can suggest two things:
1) You can set your main beauty pass to be fully denoised and add a CShading_Beauty render element that will have denoising disabled. This way, for every frame, you will get a denoised and non-denoised version of the same image. You can then use this in your compositing software to blend between the denoised and non-denoised result (e.g. set opacity to 95% or so and check if the issue is resolved).
2) You can manually introduce a bit of noise to your image. It actually works. :) https://www.rene-algesheimer.com/get-rid-of-banding-2/
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Thanks for your answers.
I work in Fusion but yes, everything is set up in 32bit.
Great, that works :) So I'm either gonna use a bit smaller amount for animations like max 0.8-0.9 instead of 1 or I'll just add a bit of noise that hides banding.
So thanks again for your help!