I’m aware that these ‘wrong’ approaches like keying/compositing on graded footage happens. We’ve had these situations too for some of our projects. But I’m not fully confident that it makes it a reason for ACES to amend to such practices when at the same time it wants to be a pleasing DRT to use for grading? But that’s my view based on what I see. Could be proven totally wrong here.
I must admit that some human error has slipped in. While double checking against the exported .exr in resolve I must’ve copied the ACESTransform node rather than the DCTL version of v055 which showed the same. Apologies for this confusion, I checked again and this is indeed smooth!
The green curve is still trending down first before going up however. Not sure if that makes sense in the rendering because blue becomes more pure the less pure it becomes in ACEScg values, before further desaturating through remainder of the gradient.
I would also still hope there could be improvements in the DRT where compression creates hard transitions between compressed (out of gamut) and non compressed values when they transition in that blue area.