Chaos Corona for 3ds Max > [Max] General Discussion

Does a higher resolution image require more passes?

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Jpjapers:
Does a higher res image require more passes to reach a certain noise level? Or does each pass just take longer?
For instance will and image of 1000x1000 and an image of 5000x5000 reach a 3% noise level at the same number of passes but each pass takes a longer time on the 5000x5000 image?

Ive never really thought about it before, i usually just let it run until it looks nice.

This help page is really useful but it didnt answer my question unless i missed it.

https://support.chaos.com/hc/en-us/articles/4528236666257-How-many-passes-is-enough

TomG:
Actually, higher resolutions usually need less passes to visually "look as good", though I don't know how that translates into noise level. But of course it still takes longer to get there, due to the extra processing needed for all the extra pixels :)

Jpjapers:

--- Quote from: TomG on 2024-05-15, 15:56:50 ---Actually, higher resolutions usually need less passes to visually "look as good", though I don't know how that translates into noise level. But of course it still takes longer to get there, due to the extra processing needed for all the extra pixels :)

--- End quote ---

Interesting, thanks Tom. Just doing a lot more render farm work recently and trying to wrap my head around the pricing has raised some questions. this being one of them.

Juraj:
Less passes to look visually good, but also less passes for same noise, but never checked any formula :- ).

But this is good thing to pay attention, so you don't end up with too little AA done. Since high-res images don't need as many passes for GI/Light, they can for example end up being around 2-3perc. noise (visually clean) with only 25 passes for example, but roughly 100 passes are needed for really clean anti-aliasing from my experience.

Jpjapers:

--- Quote from: Juraj on 2024-05-15, 17:25:41 ---Less passes to look visually good, but also less passes for same noise, but never checked any formula :- ).

But this is good thing to pay attention, so you don't end up with too little AA done. Since high-res images don't need as many passes for GI/Light, they can for example end up being around 2-3perc. noise (visually clean) with only 25 passes for example, but roughly 100 passes are needed for really clean anti-aliasing from my experience.

--- End quote ---

This is the sort of thing im trying to work on. Clients asking for higher and higher res images year on year and i need to get better at adjusting the finer render settings to suit the output rather than just leaving it to render for a nominal amount of time on my workstation because theres only so many hours in the day.

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