- Should VFX Pulls have the gamut compression baked in?
I don’t think so, not by convention. Agreed that not baking in the gamut compression by default would increase complexity for VFX and finishing, but… life is complex.
Baking in the reference gamut compression would also necessitate immediately inverting the compression if one wanted to use the parametric form instead (or not use compression at all, obviously). If the reference compression were baked into the view transform stack, it could be losslessly bypassed with systems like OCIO, where prepending an inverse reference gamut compression transform just prior to an “always on” forward reference gamut compression transform would optimize out to a no-op; whereas baking the reference gamut compression into a plate would “break concatenation”, so to speak.
- Should EXRs or other scene-referred media with the gamut compression “baked in” be called something other than AP0?
I think so. I was thinking AP0’ (“Aye-pee-oh prime”), maybe? (To me, AP2 implies an alternate set of primaries.)
I don’t really agree that having a canonical name for the gamut-compressed AP0 image state would increase conceptual complexity any more than potentially having both AP0 and gamut-compressed AP0 plates on a show. In fact, I feel not having a canonical, universally agreed-upon name to differentiate the image states would drastically increase complexity + confusion. Whether or not the name is used in practice is one thing, but I think it would be a mistake not to define shorthand that can be used verbally and visually in diagrams.
Also – and correct me if I’m wrong – I don’t think AMF has a means to indicate whether the gamut compression is baked into a plate, or if it’s part of the viewing transform stack. I could see studios using EXR metadata (internally) to indicate whether compression has been baked in to a plate, regardless of whether or not such metadata is allowed for ACES2065-1 deliverables.
- Is the default of “always on” in the viewing pipeline too heavy handed?
I think it depends on who’s doing the viewing, and when. “Always on” might be more appropriate for DITs and dailies grades, but I can imagine Finishing might feel differently.