I've been exploring the nice HDR footage from my new iPhone 13 Pro, on my iMac that unfortunately is one generation prior to having native HDR support (Retina 5K, 27-inch, 2019 - HDR was added to the 2020 iMac models). Even without this HDR support, HDR footage (as viewed in Apple apps) has noticeably more contrast and richer color than non-HDR footage, so I'm trying to figure out if I can use it with AE and AME to at least get "pass through" color behavior - i.e. ensure that both the original imported AE footage and the rendered HDR result from AME look the same as what Apple apps (e.g. Apple TV) display for the same content.
I've tried everything I can think of in both AE and AME that should affect color conversion, and I haven't been able to achieve this goal. So instead of dragging you through all those details yet, I'll start with a couple key observations, since I might be running into a known "you can't get there from here yet" issue.
The first clue is that AE never displays the original HDR footage the same as TV does. Logically, I believe it should if I either a) turn off color management by specifing "None" as the project working space and "Preserve RGB" as the footage's profile, or b) specify both of these as "Rec.2100 HLG W203" (which matches what MediaInfo reports Apple uses for its HDR color space). However, AE actually displays the same thing for the footage in either case (less contrast and less rich colors), which makes me wonder whether I'm missing some other setting I need to change.
The other big clue is that if I export either a) or b) to AME for rendering as HEVC (h.265), AME's encoding settings default to "Rec. 709" as the export color space, and when I change this to "Rec. 2100 HLG", and choose 203 for "HDR Graphics White", the rendered result is washed out (and matches AME's output preview with Display Color Management enabled). And neither exported result matches that of the original in AE, after importing them and dropping them into the comp with the original.
Per Adobe's "HDR for broadcasters" page in the online Premiere Pro help, I wonder if maybe both PP and AE currently only support HDR from ProRes and XAVC-Intra codecs, and not yet HEVC. I haven't found any equivalent help for AE's HDR support. That would make a lot of sense actually, if HDR support is an evolution, which Premiere's help implies. But if so, shouldn't AE's help document something about this too?
And I haven't yet explored iPhone ProRes in AE, primarily b/c they're overkill for most of my intended work, and the fact that Apple requires HEVC for so many Camera app features.
Thanx much for any insights.
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