Aftereffects Keying in ACEScg


although it’s far from comfortable, I am using an ACES workflow in Aftereffects for at least one year. With the OCIO plugin.

Again and again I face the same question: Is Keying in ACEScg a good idea? Or is Keying in Linear-Space a good idea at all? It’s always a little unpredictable what happens. I got a feeling, that the Keylight plugin is not really prepared for linear greenscreen footage. Or at least optimized for a Rec709 workflow.

So can someone help me with:

  • Can Keylight handle 32Bit linear data at all? Does it see values above 1?
  • Is ACEScg a good workingspace for such work?

Thanks for any ideas!


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I have been searching the depths of the internet for the answer to this question; to no avail.


create a shape with a soft fall off with a green value of RGB 0/5/0 for example. And a second one overlapping with a RED shape of 1/0/0. Then key this with key light. In Nuke you get a valid result and I don’t know why AE should behave in any way different in a 32-bit project.