UnityCACAO-HDRP17/com.unity.render-pipelines.high-definition/Documentation~/Authoring-LUTs.md

Lookup textures

You can use lookup textures (LUTs) in the High Definition Render Pipeline (HDRP) . To create a LUT, use external software.

Page	Description
Understand LUTs	Learn about LUTs in HDRP.
Create an LUT in Adobe Photoshop	Use Adobe Photoshop to author an LUT texture.
Create an LUT in DaVinci Resolve	Use DaVinci Resolve to author an LUT texture.