LUT File
Selects the external transform file.
Use a file format supported by the OCIO build/config in the environment.
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Color & ChannelsAdvanced
OCIOFileTransform
OCIO file-based transform
Applies a file-based OpenColorIO transform such as a LUT or supported transform file with direction and interpolation controls.
OCIOFileTransform
DaVinci Resolve · Fusion
OCIOFileTransform is useful when a color transform lives in an external file but should still be executed through OpenColorIO's processing model.
Overview
What OCIOFileTransform does
OCIOFileTransform is useful when a color transform lives in an external file but should still be executed through OpenColorIO's processing model.
Mental model
Load one transform file as a color operation, then choose how OCIO should evaluate and interpolate it.
Common uses
Apply a LUT through OCIO
Use a studio transform file
Run a CDL/CCC selection by ID where supported
Control interpolation quality for file transforms
Flow anatomy
Inputs & outputs
The port structure shows how this node fits into a Fusion graph.
Image
Image to process through the file-based OCIO transform.
Effect Mask
Optional mask that limits where the node affects the image.
OCIOFileTransform
Fusion node
Output
The processed result from this node.
Inspector
Important parameters
Start with these controls before reaching for more complicated workarounds.
Browse
Opens a file browser for the related path or resource.
CCC ID
Selects a correction entry when the source file contains multiple CDL/CCC records.
This is relevant to workflows that package multiple color decisions in one file.
Direction
Chooses forward or reverse evaluation.
Reverse requires an invertible transform and a workflow that actually expects the inverse.
Direction: Forward
Runs the operation in the forward direction.
Direction: Reverse
Runs the operation in the reverse direction.
Interpolation
Selects Nearest, Linear, Tetrahedral or Best where available.
Tetrahedral or Best can improve 3D LUT interpolation at additional cost compared with simpler modes.
Interpolation: Nearest
Uses Nearest for interpolation.
Interpolation: Linear
Uses Linear for interpolation.
Interpolation: Tetra
Uses Tetra for interpolation.
Interpolation: Best
Uses Best for interpolation.
Keyframe diamonds
Provides keyframe controls for animating the related parameter.
Practical setup
A reliable workflow
- 1
Confirm the external file and its intended input/output color spaces.
- 2
Load the file.
- 3
Select the correct CCC ID if applicable.
- 4
Choose direction and interpolation.
- 5
Compare the result against a trusted reference before publishing the transform into a shared comp.
Typical node chain
Input→
OCIOFileTransform→
Output
Examples
Where this node fits in real work
Studio LUT
Apply a studio-provided LUT using OCIO evaluation.
MediaInOCIOFileTransformComposite
Reverse technical transform
Run an invertible file transform in reverse for a controlled conversion.
InputOCIOFileTransform ReverseOutput
Troubleshooting
Common mistakes
Applying a LUT without knowing its expected input space
Using Reverse on a non-invertible creative transform
Choosing interpolation solely for speed without checking visible artifacts
Production notes
Practical tips
Store transform files under version control with the project when licensing allows.
Document the expected input and output space next to every external color file.
Related nodes