Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: notoriousbug on 2025-02-23, 10:25:46

Title: Different background image colors in rendering
Post by: notoriousbug on 2025-02-23, 10:25:46

Hi everyone, I don't understand why the image I insert into the environment is altered when it is rendered

(https://i.postimg.cc/fL2NHkT0/render-environment.jpg)

(https://i.postimg.cc/hvXqNgfZ/environment.jpg)

thnks
Not

Title: Re: Different background image colors in rendering
Post by: romullus on 2025-02-23, 14:50:20

If you're using LUT, or ACE OT Corona tonemap control might not be able to fully cancel their effect. It's the limitation of technology.

Title: Re: Different background image colors in rendering
Post by: notoriousbug on 2025-02-24, 08:41:03

thnks @Romullus!! You are right!! I have activated ACES OT in the frame buffer.

(https://i.postimg.cc/CxCvrfMr/01.jpg)

So there is no way to fix this at the moment? Can I just use photoshop to add another background?

thnks
Not

Title: Re: Different background image colors in rendering
Post by: notoriousbug on 2025-02-24, 19:28:48

In my opinion this is a problem because it becomes more difficult to find the right match when you have to insert a 3D model on a photo..isn't that the case for you too?

Title: Re: Different background image colors in rendering
Post by: romullus on 2025-02-24, 19:41:41

It's the nuisance, yes, but you have to find other ways to do what you need, since there's no way to do this reliably in Corona. You can replace the background in photoshop, or better yet, do the post-processing, including tone mapping outside of 3ds Max, where you can have much less destructive workflows.

Title: Re: Different background image colors in rendering
Post by: pokoy on 2025-02-24, 21:11:04

Quote from: notoriousbug on 2025-02-24, 19:28:48

In my opinion this is a problem because it becomes more difficult to find the right match when you have to insert a 3D model on a photo..isn't that the case for you too?

Yeah, it's a major pain. Not being able to match lighting/level/hues against backplates because of tonemapping that can't be worked back is really a problem in my case and almost every project suffers here because I can't be sure I'm 100% where it needs to be.

In case you wanna vote for it:
https://chaoscorona.ideas.aha.io/ideas/CMAX-I-27 (https://chaoscorona.ideas.aha.io/ideas/CMAX-I-27)

For some reason, the team never properly acknowledged the need for unchanged background colors, and it surely can get complicated. But even a simple solution, even if limited, would help.
Don't get your hopes up though, people want stars and the moon in the VFB and I bet it's going to be there way sooner.

Title: Re: Different background image colors in rendering
Post by: notoriousbug on 2025-02-25, 10:44:25

I agree with you!
thanks I'll vote right away too :)

thanks to everyone

ciao
Not