Artifacts on EEVEE render

maeshanne · November 20, 2020, 11:17am

I’m rendering an oil animation in EEVEE, but the final images have artifacts in them.
I’ve played around with the render settings but didn’t manage to get rid of them.

Any suggestions?

I do a brightness/contrast and saturation boost in the compositing, but even without it I get the artifacts.

Hikmet · November 20, 2020, 12:19pm

This is known gradient issue, when meet 32/16-bit to 8-bit conversion. Try “Output Properties > Post Processing > Dither” 1.0 or 2.0.

maeshanne · November 20, 2020, 12:55pm

I tried it, but it’s not making a lot of difference.

Dither 2.0

Dither 0

Hikmet · November 20, 2020, 1:10pm

This is enough. Images are 8-bit, don’t forget this.

maeshanne · November 20, 2020, 5:09pm

I rendered it at 16bit depth but I still see the artifacts.

So I can’t get a better result other than rendering it at 200% and scaling it back?

maeshanne · November 21, 2020, 10:44am

Rendering with cycles instead of eevee solves to problem.

https://twitter.com/HanneMaez/status/1330073600964112386

YAFU · November 21, 2020, 10:49am

That’s not really a solution for Eevee. Could you share your scene here?

maeshanne · November 21, 2020, 12:59pm

Yeah sure, you should be able to download the file here: https://drive.google.com/file/d/1ZN7hmFd154QDe6FGwzYHaCNI8SMUOGdU/view?usp=sharing

maeshanne · November 22, 2020, 6:13pm

I fixed it by using the bilateral blur node to blur image while retaining their sharp edges.
It quintuples the render time but is still way faster then cycles.