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VRayTexOCIO is a texture that allows the user to apply OpenColorIO (OCIO) color transformations to other textures in Maya.

The example on the right shows the same texture run through four different OCIO configurations.

Base Texture – Specifies the base texture that will be corrected using OCIO.

OCIO Configuration File – Allows the user to manually pick an OCIO configuration. If not specified, the OCIO environment variable is used.

Inpit/Output Selection – Determines how the input and output color spaces are specified

By color space – The user specifies the input and output color spaces directly.
By role – The user specifies the input and output color space depending on the task that they want to perform as defined in the OCIO configuration.

Mode – Specifies which color transformations the texture will perform.

ColorSpace – The texture performs color space conversions.
CDLTransform – The texture performs a CDL transformation.
FileTransform – The texture performs a color transformation based on another file (i.e. .3dl, .lut, .cube, etc).
LogConvert – The texture performs log2lin or lin2log conversion.
Display – The texture performs color space conversion for display.
Look – The texture performs a look transform. The OCIO config must define looks for this mode to work.

OCIO Status – A read-only attribute that provides feedback from the OCIO library.

Slope RGB – Specifies multipliers for the red/green/blue color components.

Offset RGB – Specifies offsets for the red/green/blue color components.

Power RGB – Specifies gamma values for the red/green/blue color components.

Saturation – Saturation value. A value of 0.0 makes the image grayscale.

Use File – When enabled, the CDL parameters are read from a .cc or a .ccc file instead of specified directly.

CC File – Specifies a .cc or .ccc file to read.

Color correction ID – Specifies the color correction ID as specified in the color correction file.

Direction – Specifies whether the forward or the inverse CDL transformation will be applied.

These parameters are available when the Mode is set to FileTransform.

File – Specifies a color transformation file (.3dl, .cube, .lut etc).

Color correction ID – Specifies the color correction ID if present in the file.

Direction – Specifies whether forward or inverse color transformation should be applied. Not all file formats support inverse transformations.

Interpolation – If the file contains tabulated data (i.e. .cube files), specifies how this data is interpolated. 

Nearest – No interpolation. The nearest suitable color from the table is picked up. This method is fast, but may introduce artifacts, especially in textures with smooth gradients.
Linear – The color is linearly interpolated from the nearest values in the table. This is a smooth method, but is slower than nearest.
Tetrahedral – Uses the tetrahedral method to convert colors with high accuracy. 
Best – Chooses the best interpolation method for the requested context.