Low lighting areas noise

[cecofuli]

Send us the simplified .max file.

Or, download my scene and to make a revers engineer process.

LINK

Bye

[mitviz]

O i have but i find that i get cleaner n faster renders with a simple plane light in the window, its not accurate as you say but many people dont care as long as i deliver nice looking images, but as you say its bad advice n practice but it hasnt failed me yet. I work this way with all rendering engines though n i know its not accurate but am never really after accuracy 100 percent, once it looks look am game n thats where corona excells, no matter how inaccurate i setup the scene i do in the end get very good results with corona n i do bet many others work this way if they have been rendering awhile

[cecofuli]

Honestly, CoronaSky (or HDRI) + Sun + Portal is fast enough. tThere isn't any reason to add a real Corona Arealight on windows to simulate the environment...

[mitviz]

Honestly, CoronaSky (or HDRI) + Sun + Portal is fast enough. tThere isn't any reason to add a real Corona Arealight on windows to simulate the environment...

fully true, in most cases there is no reason at all to add anything but a sun or hdri or sun alone

[sicrum]

Hi guys

I have found an answer for my original question. I took my photo cam, switch it to manual mode and played a little bit.
Finally, found out that the issue was that there was no enough illumination from HDRI outside. And instead of increasing HDRI light power I tuned ISO to 2400 that is obviously too high for the daylight room like that. Same noise you usually see when you try to make a photo in the dark and increasing cam ISO to get something visible on the photo.

Here is new render.

[PROH]

Glad you found the problem. It was what I suspected. The picture/light looks way better now :)

[cecofuli]

In my opinion, you need som CC... It's too dark, no contrast, no colors etc...

[sicrum]

In my opinion, you need som CC... It's too dark, no contrast, no colors etc...

this is raw render without postprocessing

[geesve]

Hi guys

I have found an answer for my original question. I took my photo cam, switch it to manual mode and played a little bit.
Finally, found out that the issue was that there was no enough illumination from HDRI outside. And instead of increasing HDRI light power I tuned ISO to 2400 that is obviously too high for the daylight room like that. Same noise you usually see when you try to make a photo in the dark and increasing cam ISO to get something visible on the photo.

I know this is the old topic and i see the red warning message on the top. But i just want to keep solution from this message clear because i have the same problem like OP in his first message and i did not really understand what he do here to fix that, because i'm non-native English speaker.
If i see that in the interior scene i need to increase Exposure value in Corona Frame Buffer to high values like 8 or even more - there is not really good idea and would be better to increase power of HDRI map/Corona Sun/Sky, right?
I was confused because with my current very first scene i try to keep lights inside of the room in Lumens values, which is looks very low if it converted for default "values". I mean 750 Lumens is just 1.548563 (Default:W/sr.m^2) and for now i think that this is also was not really good idea.

[maru]

Can you start a new thread about this, or submit a support ticket here? https://coronarenderer.freshdesk.com/support/tickets/new
It would be great if you could actually show your problem. I did not fully understand the problem and solution from this original thread either... If there is noise, then you could try following this guide:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501983-how-to-get-rid-of-excessive-noise-

Also, I am not sure if there is not some kind of misunderstanding here, so just for clarification:
Increasing ISO in Corona DOES NOT introduce any noise. It only impacts scene exposure.