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SMPTE / st2067-60

Public CD of SMPTE ST 2067-60
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ACES colorimetry in Application #6 #5

Open walter-arrighetti opened 3 years ago

walter-arrighetti commented 3 years ago

Isn't / shouldn't any ACES colorimetry from App #5 (ST 2067-50) be included in App #6 at all? I am referring to proper values for §6.2.3.1 (Generic Picture Essence Descriptor) and §6.2.3.2 (RGBA Picture Essence Descriptor).

dtatut commented 3 years ago

@walter-arrighetti : I'm not sure how the ACES colorimetry defined in App #5 is applicable to App #6. This application mostly targets workflows where AVC/H.264 is used as a codec throughout the entire pipeline. Moreover, H.264 does not have the capability to correctly signal ACES colorimetry anyway (see https://www.itu.int/rec/T-REC-H.264-201906-I/en )

In general App #6 works with display-referred material, not scene referred material. So can you elaborate a bit on your comment?

pngardiner commented 3 years ago

I believe ACES colorimetry to be out of scope of App #6, for the reasons given above. Also, the envisaged use case is to facilitate late editorial changes to be made to a completed AVC/H.264 master program file.