Make Custom LUTs work with ACES OCIO

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Make Custom LUTs work with ACES OCIO

Postby lanklaf » Tue Jan 05, 2021 2:42 pm

lanklaf Tue Jan 05, 2021 2:42 pm
Camera Imager's "Custom LUT" option is not available in OCIO mode.
To use LUTs, you must convert them to OCIO LOOKs,
which can be selected in the OCIO Camera Imager tab:

Image

How to convert LUTs to Looks:
For ACES config users

1) Drop your LUT files into the luts directory of the OCIO config
2) Add this code to the bottom of the config.ocio file:
Code: Select all
looks:
  - !<Look>
    name: 1st Look name goes here
    process_space: Output - Rec.709
    transform: !<FileTransform> {src: lut_filename_goes_here.cube, interpolation: best}

  - !<Look>
    name: 2nd Look name goes here
    process_space: Output - Rec.709
    transform: !<FileTransform> {src: lut_filename_goes_here.cube, interpolation: best}

  - !<Look>
    name: 3rd Look name goes here
    process_space: Output - Rec.709
    transform: !<FileTransform> {src: lut_filename_goes_here.cube, interpolation: best}

Info:
- You can use almost any LUT file: .cube, .3dl, etc.
- The "process_space" should be the space your LUTs are for"
  • For regular Rec.709 LUTs, "process_space" is "Output - Rec.709"
  • For ARRI LUTs, "process_space" is "Input - ARRI - V3 LogC (EI200) - Wide Gamut"
  • etc.

You can also put your LUTs in a different folder.
I created a separate folder and named it "looks".
But if you do this, you will need to change this config.ocio line:
Code: Select all
search_path: luts

to this:
Code: Select all
search_path: "luts:looks"

Thanks @karu for sharing this information.
Attachments
Looks.gif
Looks.gif
Last edited by lanklaf on Tue Jan 12, 2021 11:34 pm, edited 4 times in total.
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Re: Custom LUTs in OCIO / ACES workflow

Postby james_conkle » Tue Jan 05, 2021 10:50 pm

james_conkle Tue Jan 05, 2021 10:50 pm
Wow this is great!! Thanks for posting how to do this. Being able to get the same look in the live viewer and Resolve, without being “baked in”, is a total game changer. Before replicating the same look with the camera imager wasn’t always accurate.
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