LUT

A lookup table (LUT) maps input color values to output values. It can correct an image or give it a different creative appearance. A three-dimensional LUT uses the combination of red, green and blue input values to choose the output color. This lets it change colors in ways that separate adjustments to each channel cannot. Apple’s LUT definition

BetterDisplay can apply custom LUT filters to supported displays and streams. Import a LUT to make it available in the app, then select it for the display or preview where you want to use it.

The LUT's expected color space matters. The same numbers can produce different results when interpreted in different spaces, so choose the space the LUT was created for.

A LUT is not interchangeable with an ICC color profile. See Custom LUT Filters for importing and configuring filters.