Hey, I'm really struggling with compositing in ACES 1.3
I have a beautiful jewelry shot as part of an animation, which I need to comp over an sRGB .jpg backplate.

ACES 1.3 for Nuke & DaVinci require me to apply a "inverse display transform" (see screenshot) to get sRGB files to display and behave correctly.

But for some reason I just can't find this option or an equivalent in COPs.

The "OCIO transform" node doesn't seem to have any option for this at all.
And only seems to work with ACES 1.2 -- where the Original Space can be set to "Output - sRGB". And then To Space: "ACES - ACEScg" (see ACES 1.2 screenshot in Houdini 20.5.332)

How is this supposed to work in Houdini under ACES 1.3 or where did they hide the "inverse display transform" options which are required in other compositing software to make this work?


Thanks for your time and help, I really appreciate it.

Edit: This is solved and the "OCIO transform" node now has an "Invert Transform" checkbox. Hope this helps.

bump this.

I'm wondering the same how to do this correctly without the invert direction.

looks like an oversight. You could work around it the old school way by pretending the config is an OCIO 1.0 config and creating colorspaces to represent the display-view transforms. Then they should work in reverse by swapping the from and to colorspace fields of the OCIO transform node.

Hey, just to update and close this.
The new versions of Houdini now have an "Invert Transform" checkbox in the "OCIO transform" node, which allows us to do this correctly
I have just used this with ACES 2.0 (cg-config-v3.0.0_aces-v2.0_ocio-v2.4.ocio) and can confirm that this works as intended.