matte paint about aces nuke

Sorry, I missed your question.

Here is how I am used to deal with matte-painting, Photoshop and ACES:

  • Let’s say I have an ACEScg render that I want to paint over in Photoshop.
  • I would convert it to ACEScct in Nuke and then import it to Photoshop.
  • In Photoshop, I would use a “color lookup” layer to load my “Display” LUT.
  • At exporting from Photoshop, I would disable this layer and import back in Nuke as ACEScct.

I described this workflow more extensively here.

You could grade it to get closer to your final result, rather than inverting the Output Transform.

Regards,
Chris