UnityCACAO-HDRP17/com.unity.render-pipelines.high-definition/Documentation~/rendering-luts-understand.md

Understand lookup textures

Lookup textures (LUTs) are color cubes that HDRP can apply to produce a final color-graded image. HDRP takes the original image color as a vector and then uses that to address the LUT to get the graded value. LUTs for the High Definition Render Pipeline (HDRP) use a CUBE file.

The guides in this section describe how to create an sRGB-targeting CUBE file with different external software, import it into a Unity Project that uses HDRP, and use it for color grading in your Scene.

You can use the following software to create a lookup texture:

• Adobe Photoshop.
• DaVinci Resolve.