Hello,
@carolalynn, @doug_walker and I have been working on the new release for the OCIO Configs for ACES and we have added AMF Components to the various colourspace descriptions. Here are a few cherry-picked examples:
- !<Look>
name: ACES 1.3 Reference Gamut Compression
process_space: ACES2065-1
description: |
LMT (applied in ACES2065-1) to compress scene-referred values from common cameras into the AP1 gamut
ACEStransformID: urn:ampas:aces:transformId:v1.5:LMT.Academy.ReferenceGamutCompress.a1.v1.0
AMF Components
--------------
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvLMT.Academy.ReferenceGamutCompress.a1.v1.0
transform: !<BuiltinTransform> {style: ACES-LMT - ACES 1.3 Reference Gamut Compression}
- !<ViewTransform>
name: ACES 1.0 - SDR Video
description: |
Component of ACES Output Transforms for SDR D65 video
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.RGBmonitor_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.DisplayP3_dim.a1.0.0
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.Rec709_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.Rec2020_100nits_dim.a1.0.3
AMF Components
--------------
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.RGBmonitor_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.DisplayP3_dim.a1.0.0
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.Rec709_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.Rec2020_100nits_dim.a1.0.3
from_scene_reference: !<BuiltinTransform> {style: ACES-OUTPUT - ACES2065-1_to_CIE-XYZ-D65 - SDR-VIDEO_1.0}
- !<ColorSpace>
name: sRGB - Display
aliases: [srgb_display]
family: Display
equalitygroup: ""
bitdepth: 32f
description: |
Convert CIE XYZ (D65 white) to sRGB (piecewise EOTF)
AMF Components
--------------
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.RGBmonitor_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.RGBmonitor_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:ODT.Academy.RGBmonitor_D60sim_100nits_dim.a1.0.3
ACEStransformID: urn:ampas:aces:transformId:v1.5:InvODT.Academy.RGBmonitor_D60sim_100nits_dim.a1.0.3
isdata: false
categories: [file-io]
encoding: sdr-video
allocation: uniform
from_display_reference: !<BuiltinTransform> {style: DISPLAY - CIE-XYZ-D65_to_sRGB}
- !<ColorSpace>
name: ACEScg
aliases: [ACES - ACEScg, lin_ap1]
family: ACES
equalitygroup: ""
bitdepth: 32f
description: |
Convert ACEScg to ACES2065-1
ACEStransformID: urn:ampas:aces:transformId:v1.5:ACEScsc.Academy.ACEScg_to_ACES.a1.0.3
AMF Components
--------------
ACEStransformID: urn:ampas:aces:transformId:v1.5:ACEScsc.Academy.ACES_to_ACEScg.a1.0.3
isdata: false
categories: [file-io, working-space, texture]
encoding: scene-linear
allocation: uniform
to_scene_reference: !<BuiltinTransform> {style: ACEScg_to_ACES2065-1}
- !<ColorSpace>
name: BMDFilm WideGamut Gen5
aliases: [bmdfilm_widegamut_gen5]
family: Input/BlackmagicDesign
equalitygroup: ""
bitdepth: 32f
description: |
Convert Blackmagic Film Wide Gamut (Gen 5) to ACES2065-1
CLFtransformID: urn:aswf:ocio:transformId:1.0:BlackmagicDesign:Input:BMDFilm_WideGamut_Gen5_to_ACES2065-1:1.0
ACEStransformID: urn:ampas:aces:transformId:v1.5:IDT.BlackmagicDesign.BMDFilm_WideGamut_Gen5.a1.v1
AMF Components
--------------
ACEStransformID: urn:ampas:aces:transformId:v1.5:ACEScsc.Academy.ACES_to_BMDFilm_WideGamut_Gen5.a1.v1
ACEStransformID: urn:ampas:aces:transformId:v1.5:ACEScsc.Academy.BMDFilm_WideGamut_Gen5_to_ACES.a1.v1
isdata: false
categories: [file-io]
encoding: log
allocation: uniform
to_scene_reference: !<GroupTransform>
name: Blackmagic Film Wide Gamut (Gen 5) to ACES2065-1
children:
- !<LogCameraTransform> {base: 2.71828182845905, log_side_slope: 0.0869287606549122, log_side_offset: 0.530013339229194, lin_side_offset: 0.00549407243225781, lin_side_break: 0.005, direction: inverse}
- !<MatrixTransform> {matrix: [0.647091325580708, 0.242595385134207, 0.110313289285085, 0, 0.0651915997328519, 1.02504756760476, -0.0902391673376125, 0, -0.0275570729194699, -0.0805887097177784, 1.10814578263725, 0, 0, 0, 0, 1]}
We met a few challenges whilst doing that:
- There is no canonical and authoritative source to pull those components from.
- aces-dev does not have enough information to establish the relations between the various CTL pieces, for example, nothing relates
urn:ampas:aces:transformId:v1.5:IDT.BlackmagicDesign.BMDFilm_WideGamut_Gen5.a1.v1tourn:ampas:aces:transformId:v1.5:ACEScsc.Academy.ACES_to_BMDFilm_WideGamut_Gen5.a1.v1. - Some IDTs, e.g. V-Log V-Gamut, are not in aces-dev.
With that in mind, I would be keen to discuss on how to solve that? It seems like, if AMF is to be adopted, a dataset/database of some sort must be designed and maintained authoritatively so that people can refer to it. It would, for example, have been extremely useful that for a given ACEStransformID request to an online API, e.g. REST, a response with the related AMF Components is returned. A JSON file in aces-dev could also describe those relations. We for example created one for the purpose of the OpenColorIO Config for ACES that helps us finding the missing ones: https://github.com/AcademySoftwareFoundation/OpenColorIO-Config-ACES/blob/ccf11e8c53641aebf9894acee6c91c06bd217399/opencolorio_config_aces/config/reference/discover/resources/ACES_AMF_Components.json
Cheers,
Thomas