ACES linear in Live Viewer Tweet

[Hurricane046]

Hello,

I've read tons of stuff here on forum about ACES color space. The more I read through all of it the more I'm confused. So for the sake of everyone involved I pose only one question today:

Why does ACES linear in Live Viewer look like this?



I can't find any literature in the manuals (in the C4D one or standalone one either).

Thanks for any kind of feedback!

[bepeg4d]

Just for curiosity, how many times, in your everyday work, do you have to manage video footages coming from different Cameras?
ciao Beppe

[Hurricane046]

Zero times, why?

[nejck]

I would probably recommend to start with Chis Brejons' online "book" (https://chrisbrejon.com/cg-cinematograp ... stem-aces/). I think its great if you want to understand whats up with ACES.

All that said, ACES in Octane still isn't quite fully implemented - you can't change the inputs yet. Hopefully that'll be taken care of in future versions.

[bepeg4d]

Zero times, why?

https://chrisbrejon.com/cg-cinematograp ... /#why-aces

ciao Beppe

[james_conkle]

That's a crazy first answer there! Sorry Hurricane I too would love to know more about the ACES implementation in Octane, but as someone who's used it in Arnold I can only tell you to skip it for now.

Octane has a fine implementation of a spectral engine that does an even better job behind the scenes in dealing with the mixing of color and light compared to a RGB based approach with an ACES view. That's why I get Beppe's answer because unless you're mixing footage in an ACES environment there's not much need for it in Octane. A lot of benefits are already there / surpassed with the spectral engine to put it simply.

[charlieL]

That's a crazy first answer there! Sorry Hurricane I too would love to know more about the ACES implementation in Octane, but as someone who's used it in Arnold I can only tell you to skip it for now.

Octane has a fine implementation of a spectral engine that does an even better job behind the scenes in dealing with the mixing of color and light compared to a RGB based approach with an ACES view. That's why I get Beppe's answer because unless you're mixing footage in an ACES environment there's not much need for it in Octane. A lot of benefits are already there / surpassed with the spectral engine to put it simply.

Well saving a file witin ACES2065-1 color space is by itself a big benefit. except if you dont plan to do compositing or color correction of course.
but it is true that ACES implementation is not yet properly implemented.

However

Why does ACES linear in Live Viewer look like this?

Simply because ACES does not use the Tonemapper(response), nor Gamma nor Saturation.
if you want you can set your render in LDR 8Bit, set your response to Linear, gamma 1 and saturation 1. and you will get something close to ACES at least in term of light intensity. there will be a color shift, probably to the red. ( wild guess here but, this color shift is maybe due to the cropping of the largest ACES color space by your monitor, as it is not able to render the full spectrum.)