Yellow tint?

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Yellow tint?

Postby DGruwier » Mon May 16, 2016 9:40 am

So I've been messing with the Octane demo for Cinema 4D. Fun stuff, but everything has this yellow tint. Where does that come from?

tint.jpg


I figured it might be the default environment light that is slightly tinted. I can't figure out where to turn that off, but I get the same tint even when I enclose everything in a cube. It seems like it's just a general filter over the image, like a post effect, but I haven't enabled any of those.
tintt2.jpg
Last edited by DGruwier on Mon May 16, 2016 9:52 am, edited 1 time in total.
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Re: Yellow tint?

Postby calus » Mon May 16, 2016 9:50 am

response.jpg
response.jpg (14.17 KiB) Viewed 4026 times

This yellow tint come from the camera response defaulting to Agfa_futura_100cd.
You can enable "natural response" to get rid of the tint, but to have a really neutral response select the "linear" profil and put gama to 2.2

responseLinear.jpg
responseLinear.jpg (6.93 KiB) Viewed 4025 times
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Re: Yellow tint?

Postby bepeg4d » Mon May 16, 2016 10:01 am

Hi DGruwier,
Octane starts with a default Agfa camera response curve that is not neutral:
CatturaCameraImager.JPG

Please switch to Linear response and change the Gamma to 2.2 for a neutral response in v2:
CatturaCameraImager3.JPG

In v3 there is an option for Neutral response that can be enabled with any kind of response curve ;)
ciao beppe

edit: calus has been faster than me :D
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Re: Yellow tint?

Postby DGruwier » Sat May 21, 2016 8:37 pm

I see, thanks both! Weird choice having something like that enabled by default (along with vignette), but as long as it can be turned off everything's good.
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Re: Yellow tint?

Postby OuterGamut » Wed Feb 15, 2017 1:10 am

Can I ask, why is this standard?

It seems pretty logical to start everyone off with at least a neutral space with zero vignetting.

Does the linear workflow depend on your c4d preferences and whether or not you are working in a true linear space?

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Re: Yellow tint?

Postby bepeg4d » Wed Feb 15, 2017 10:43 am

Hi Conor,
I don't have an exact answer, anyway it is set in this way from the very beginning.
Maybe to involve the user to play with the Camera Imager in real time :D
Anyway, in c4doctane, you can save several presets and recall them when needed:
IMG_0079.JPG

And here is an article about the linear workflow and OctaneRender:
http://render.otoy.com/forum/viewtopic.php?f=21&t=33214
Happy rendering,
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Re: Yellow tint?

Postby OuterGamut » Wed Feb 15, 2017 4:21 pm

Thanks!

Coming from a photo background I have used a lot of those films, developed them and know their grain sructure and tints. There is well-received effort to make images photographically real in octane. Happy to see many familiar concepts put into play.
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