[PPRO] Apply custom LUT as effect

[SultanDino]

We have developed a Premiere Pro extension with which we fetch a custom lut file and apply it as a effect in Lumetri Color (Creative or Basic).

Starting from Premiere pro 23.4, the functionality to apply a custom lut programmatically has stopped working and I can't figure out why. I already tried various settings and changes, but I am running out of ideas. Something have changed in Adobes API and the way it applies custom LUT files.

Here is a list of PPRO versions with which the extension worked fine:
22.5 | Working
23.0 | Working
23.1 | Working
23.2 | Working
23.3 | Working
23.4 | Not working
23.5 | Not working
23.6 | Not working
24.0 | Not working

I already wrote about it in the Adobe forum.
Maybe someone can help me and give me some information on how to get this to work?

[SultanDino]

Here is the code sample from ExtendScript with which I loop through the Effect's properties to apply a custom LUT as Basic Correction

for (var i = 0; i < effect.properties.numItems; i++) {
  if (effect.properties[i].displayName == "Basic Correction") {
      effect.properties[i + 1].setValue(1, true); // Enable effect
      effect.properties[i + 2].setValue(LUTPath, true); // Set LUT Path
      effect.properties[i + 4].setValue(1, true); // Update LUT selection dropdown
  }
}

[tristancgardner]

agreed, and it's terribly aggravating.

[ErinFinnegan]

@tristancgardner so it's still happening, I take it?

@bbb999 and @justintaylor-dev investigated it in the forum thread...

[justintaylor-dev]

@SultanDino @tristancgardner @ErinFinnegan

I just tested in PPRO 25.1.0 and it's still working. Here's an example of how to set the LUT path for the Input LUT on a clip and a project item / master clip

// Clip Example
var clip = app.project.activeSequence.videoTracks[1].clips[0];
var pathToLut = 'C:\\Program Files\\Adobe\\Adobe Premiere Pro 2024\\Lumetri\\LUTs\\Technical\\Phantom_Rec709_Gamma.cube';
var lumetri = clip.components[2];
var lutPath = lumetri.properties[4];
var input = lumetri.properties[6];
lutPath.setValue(pathToLut);
input.setValue(1);

// Project item / Master Clip Example
var projectItem = app.project.activeSequence.videoTracks[0].clips[0].projectItem;
var pathToLut = 'C:\\Program Files\\Adobe\\Adobe Premiere Pro 2024\\Lumetri\\LUTs\\Technical\\Phantom_Rec709_Gamma.cube';
var lumetri = projectItem.videoComponents()[0];
var lutPath = lumetri.properties[4];
var input = lumetri.properties[6];
lutPath.setValue(pathToLut);
input.setValue(1);

If you're still having issues, maybe try different path formats, they seem to be picky per OS.

[sir-editor]

I've tested on macOS and Windows.
It works technically: if I will test values with getValue I will get correct results.
However, visually media is not affected by an applied LUT.

PPRO 22.6.4 [mac] - works
PPRO 24.0.0 [win] - doesn't work visually
PPRO 25.1.0 [mac] - doesn't work visually

@justintaylor-dev do you see media being affected by LUT?