Different material saturation if change image resolution

[albertoiuav]

Hi all,

doing a test at 1500 pixels (full image) and 3000 pixels, I get two objective results. You can find them attached.
In the 3000-pixel image the bushes appear to have correct saturation, while in the smaller image they seem much less saturated and darker.

With interactive render I encounter the same problem, to get the correct saturation I have to use the 2d Pan Zoom mode and zoom in on the bushes.

I never had this problem in the past, if I rendered a 1k or 5k image the result was identical.
I am using Max 2022 and Corona 9 Hotfix 2.

The leaf material has translucency with Fraction at 0.5 and a leaf texture for Translucency color, no volume or refraction enabled.

Thanks in advance for any help.

[romullus]

I don't think that has anything to do with saturation. My bet would be on texture filtering. Most likely offenders would be opacity, translucency, or maybe even bump (normal) maps. Try to set texture filtering to the lowest possible values, or even temporarily disable those maps and run the test with different output resolutions again. See if the difference remains.

P.S. opacity maps should be excluded from filtering in Corona by default, but one never knows if you have override this feature in your scene for some reasons.

[maru]

Looks very similar to this:
https://forum.corona-renderer.com/index.php?topic=40827.0

Ideally, we would need a scene to find out what is going on. You can share it here: https://support.chaos.com/hc/en-us/requests/new