How do you create or find IDT?

ACES Resources & Education Videos
1

Hello everyone, I’m using VEGAS Pro 18 software as my main NLE. VEGAS Pro does support ACES workflow.

But in VEGAS Color space menu, (I think same as Davinci Resolve IDT as well), I can either pic between Slog2 with Sgamut or Slog3 with Sgamut3.cine. There is no any option for me to pick Slog2 with Sgamut3.cine. Same applies to Davinci Resolve too when picking up IDT.

Because I mixed my Gamma & Gamut in my sony picture profile 7, SLog2 with Sgamut3.cine.

I’m new to ACES workflow, and wanted to learn & experiment more with ACES. Thanks!

2

What camera did you shoot? I don’t think it should be possible to use SLog2 with SGamut3.cine

3

@llamafilm I’m using Sony a6500. I customize my picture profile 7 to be Slog2 with Sgamut3.cine.
So I was wondering how can I make custom IDT for that.

4

I don’t know Vegas, but I believe it uses OpenColorIO for its colour management. If you can find the config file it is using, you can modify that in a text editor to create an additional colour space for what you need from the existing components.

Basically you would duplicate the S-Log3 one in config.ocio and change it to use the S-Log2_to_linear.spi1d file instead of S-Log3:

  - !<ColorSpace>
    name: Input - Sony - S-Log3 - S-Gamut3.Cine
    family: Input/Sony
    equalitygroup: ""
    bitdepth: 32f
    description: |
      S-Log3 - S-Gamut3.Cine
      
      ACES Transform ID : IDT.Sony.SLog3_SGamut3.Cine_10i.a1.v1
    isdata: false
    allocation: uniform
    allocationvars: [0, 1]
    to_reference: !<GroupTransform>
      children:
        - !<FileTransform> {src: S-Log3_to_linear.spi1d, interpolation: linear}
        - !<MatrixTransform> {matrix: [0.638789, 0.272351, 0.0888599, 0, -0.00391591, 1.08807, -0.0841573, 0, -0.0299072, -0.0264326, 1.05634, 0, 0, 0, 0, 1]}
2 Likes
5

The Vegas Pro 18 config.ocio is found in the folder C:\Program Files\VEGAS\VEGAS Pro 18.0\OpenColorIO\configs\aces_1.1

1 Like
6

Sorry, can I know how do I modify the file? The coding looking text you gave me doesn’t
look similar when I open the file with notepad lol.

Sorry for late responses, I unable to log in into my ACES acc for some reason, only today I manage to log in

7

Oh my bad! I was looking at the wrong file this whole time lol!
Will give it a try and see
Thanks pal!

Screenshot (379)
Screenshot (379)3840×2160 463 KB

8

This is Slog 2 Sgamut code

  • !
    name: Input - Sony - S-Log2 - S-Gamut
    family: Input/Sony
    equalitygroup: “”
    bitdepth: 32f
    description: |
    S-Log2 - S-Gamut

    ACES Transform ID : IDT.Sony.SLog2_SGamut_10i.a1.v1
    isdata: false
    allocation: uniform
    allocationvars: [0, 1]
    to_reference: !
    children:
    - ! {src: S-Log2_to_linear.spi1d, interpolation: linear}
    - ! {matrix: [0.754339, 0.133697, 0.111968, 0, 0.0211981, 1.00541, -0.0266105, 0, -0.00975699, 0.00450856, 1.00525, 0, 0, 0, 0, 1]}

Which line do I replace/modify? Is this correct?

  • !
    name: Input - Sony - S-Log2 - S-Gamut3.cine
    family: Input/Sony
    equalitygroup: “”
    bitdepth: 32f
    description: |
    S-Log2 - S-Gamut3.cine

    ACES Transform ID : IDT.Sony.SLog2_SGamut3.cine_10i.a1.v1
    isdata: false
    allocation: uniform
    allocationvars: [0, 1]
    to_reference: !
    children:
    - ! {src: S-Log3_to_linear.spi1d, interpolation: linear}
    - ! {matrix: [0.638789, 0.272351, 0.0888599, 0, -0.00391591, 1.08807, -0.0841573, 0, -0.0299072, -0.0264326, 1.05634, 0, 0, 0, 0, 1]}

9

Sorry for bringing up an old topic but can anyone confirm if this custom IDT is correct?

I’d like to get IDT for S-log2 / s.gamut3.cine aswell.

Should the line on the bottom row be - ! {src: S-Log2_to_linear.spi1d, interpolation: linear} instead of

  • ! {src: S-Log3_to_linear.spi1d, interpolation: linear} or is the conversion made by alifftudm95 correct?