Keying using a CremaTTe 3D LUT from the Library
In 
Inputs, select an input.⚓
Click Keying and CremaTTe 3D mode.
The input’s color space must be the same as the color space set for processing in system pre-configuration.
Enable Freeze on the content.
In CremaTTe 3D LUT, select a LUT from the CremaTTe 3D LUT library.
The LUT is used for the keying of the input group.
Enable / Disable Freeze and Color mask to view the keying result.
Advice : Importing a LUT in the library⚓
See Importing a LUT.