The operator elements specify the operations to be applied to the color data. You can have as many as you like in a ProcessList element, in the order in which they are to be applied.
Several attributes are common to all of the color transform operator elements.
The LUT1D element specifies a 1D LUT to apply.
The LUT3D element specifies a 3D LUT to apply.
The Matrix element specifies a matrix for multiplying color values, and optionally applying an offset.
The Range element maps the input domain to the output range by scaling and offsetting values.
The Gamma element applies a gamma correction to color values.
The ExposureContrast element simulates adjusting the exposure of an image, and also modifies the contrast between light and dark colors.
The Reference element refers to another CTF file by path or by alias. The external file is imported into the corresponding location of the ProcessList.