ACES Flat Shading Incorrect

[cassidydodge2]

Hi there,

I am trying to render a flat background based on a set RGB/Hex value but the colour appears much darker in the IPR and final render than what it should be.

Attached is a screengrab of the render. I've extended the background in Photoshop using my original RGB/Hex colour to demonstrate what it should look like.

Note: My background is a flat shadowmatte but even as a a flat plane it renders out just as dark.

[cassidydodge2]

Sorry, I forgot to add that I am in the default colour space, ACES.

[lee_griggs]

Does it happen without the shadow_matte?

Does it render like that with sRGB?

[cassidydodge2]

Hi Lee,

Yes, I have the same issue even with a flat shader in ACES.

If I switch to Legacy in the Color Manager I get very close to an actual match (see below) but I would prefer to ACES if I can.

[peter.horvath6V6K3]

In which color space do you have your input RGB values? Colors in Cinema 4D are in sRGB space by default (Edit > Project Settings... > Input Color Profile), therefore there's an sRGB to linear (ACEScg) transform when exported to Arnold.

[cassidydodge2]

Hi Peter, Yes, my input color space is sRGB. What should it be set to in order to get the correct values with Arnold and ACES?

[peter.horvath6V6K3]

Actually, I think what you want is changing the View Color Space to Un-tone-mapped (sRGB). The default view color space (ACES 1.0 SDR-video) has a tone mapping which makes the result darker.

I assume your display color space is Photoshop is sRGB and so is your input color.