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# Operator Elements

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.

NoteThe inBitDepth attribute of each operator must match the outBitDepth attribute of the previous operator in the chain. See Common Operator Attributes.

#### Topics in this section

- Common Operator Attributes

  Several attributes are common to all of the color transform operator elements.

- LUT1D

  The LUT1D element specifies a 1D LUT to apply.

- LUT3D

  The LUT3D element specifies a 3D LUT to apply.

- Matrix

  The Matrix element specifies a matrix for multiplying color values, and optionally applying an offset.

- Range

  The Range element maps the input domain to the output range by scaling and offsetting values.

- Gamma

  The Gamma element applies a gamma correction to color values.

- ExposureContrast

  The ExposureContrast element simulates adjusting the exposure of an image, and also modifies the contrast between light and dark colors.

- Reference

  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.