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9.0, 8.0 or later
LUTRecoverMerge will combine the results of two 3D LUTs generated by LUTRecover to produce a better result.
If you have multiple sets of before and after frames that cover different parts of the cover range, you can recover LUTs from each pair using LUTRecover and then merge those results using LUTRecoverMerge.
The recover1 and recover2 images should have matching resolution.
This node will execute very quickly, so don't worry about stringing lots of them together.
This node can be passed directly to a GenerateLUT node if you want to then write your LUT to disk.
The Blink source code is available on Nukepedia and on github here:
An example Nuke script can be downloaded from github here:
Example Images (from LUTRecover)
Here we have the 'before' and 'after' images. We use a CMSTestPattern image for the 'before' to make sure that the full range of input values is covered for the example.
The first CMSTestPattern image below that is used to determine the resolution of the recovered LUT. This example uses resolution 33. The second image is the recovered LUT. This can be fed into a GenerateLUT node to write the LUT to disk or a LUTApply BlinkScript node to compare the recovered LUT to the graded 'after' image, which is the third image below.
Notice that the third image above doesn't match exactly the second image from the first row of images. If we add more pairs of images into the solve, we can produce a better result. The three images below show a successively more accurate approximation of the original LUT.