Eyeon:Manual/Fusion 6/File LUT

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File LUT

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File LUT [FLU]

Image:Icon_FileLUT.png

The File LUT tool applies a look up table (LUT) to the image, either a simple 1D LUT or (as of Fusion 5.2) a supported 3D LUT. Unlike the Color Curves tool it does not use a spline-based LUT. Instead it loads the LUT from a file stored on the system or network.

This approach has two advantages. The first is that the only part of the LUT stored in the composition is the path to the file. Since LUT files can be very large, this can dramatically reduce the file size of a composition when several LUTs are present. The second advantage is that it becomes possible to adjust all File LUT tools using the same file at the same time, simply by changing the contents of the LUT. This can be useful when the same LUT-based color correction is applied in many different compositions.

Contents




Controls


LUT File

Use this control to select the path to the file describing the LUT. Currently this tool supports LUTs exported from Fusion in .LUT and .ALUT formats, and (as of Fusion 5.2) Shake's LUT format and a number of 3D LUT formats as well. The tool will fail with an error message on the Console if it is unable to find or load the specified file.


Color Space

Use this control to change the color space the LUT is applied in. The default is to apply the curves described in the LUT to the RGB color space, but options for YUV, HLS, HSV and others are also available.


Pre-Divide/Post Multiply

Selecting the Pre-Divide/Post-Multiply checkbox will cause the image pixel values to be divided by the alpha values prior to applying the LUT, and then re-multiplied by the alpha value after the correction.

This helps to prevent the creation of illegally additive images, particularly around the edges of a blue/green key or when working with 3D rendered objects.





Tips for File LUT (edit)

Since Fusion 6.3, there are three fuses that you can use to quickly turn a color correction into a file LUT that you can use with this tool:

  • LUTCubeCreator - Creates an image containing all values of an RGB cube.
  • LUTCubeAnalyzer - Builds a 3D LUT based on a modified/colour adjusted image originally containing all values of an RGB cube.
  • LUTCubeApply - Builds and applies a 3D LUT based on a modified colour cube image.



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