3D LUT
A look-up table that maps colours in three dimensions, so a transformation can change hue and saturation as well as tone.
Measured in
cube size (17, 33, 65)
In depth
A one-dimensional LUT can only adjust each channel independently, which limits it to curves. A three-dimensional table addresses every combination of red, green and blue, allowing a transformation that turns one specific colour without affecting others. Larger cube sizes give finer resolution and larger files.
Examples in practice
A 33-point 3D LUT converts a camera's log footage to Rec. 709 while shaping skin tones in a specific way.