Paul Mahol (ffmpeg dev) pointed me at this technology, available as ffmpeg filter too:

http://www.quelsolaar.com/technology/clut.html

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Concept:

A Hald CLUT is an image that has a specific color pattern on it. In this pattern all colors in the color space are represented. An application that uses the HALD CLUT image to color correct an image, takes a source image color and looks it up in the color pattern of the HALD CLUT, and the color it finds in that place is the corrected color that should replace the source color in the destination image. If the color doesn't exist in the CLUT, one can look up several colors and interpolate between them. 

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files usually in png format ...

http://underpop.online.fr/f/ffmpeg/help/haldclut.htm.gz


https://github.com/cedeber/hald-clut

not HDR, just 8bit sRGB ...

https://discuss.pixls.us/t/how-to-create-haldcluts-from-in-camera-processing-styles/12690

sort of "extracts" processing in-camera as  look-up table image!

https://github.com/cameramanben/LUTCalc

um, web application (!!) for generating those lut files for some cameras ....

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A Web App for generating 1D and 3D Lookup Tables (LUTs) for video cameras that shoot log gammas, principally the Sony CineAlta line.

LUTCalc generates 1D and 3D .cube format LUTs suitable for use in DaVinci Resolve, Adobe Speedgrade and as user 3D LUTs in Sony's log-recording video cameras. These include the PMW-F5, PMW-F55 and PXW-FS7.

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сб, 27 мая 2023 г., 17:31 Andrew Randrianasulu <randrianasulu@gmail.com>:
Hm ...


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Tone Map Metadata (3D Look-Up-Table) Injector

A tool for manipulating production metadata, specifically tone map metadata (3D LUT), in MP4 and MOV files. It can be used to inject 3D LUT metadata into a file or validate metadata in an existing file.

Usage

Python 3.11 must be used to run the tool. >From within the directory above lut3d_utils:

Help

python lut3d_utils -h

Prints help and usage information.

Inject

python lut3d_utils -inject_lut3d -i ${input_file} -o ${output_file} -l ${lut3d_file} -p COLOUR_PRIMARIES_BT709 -t COLOUR_TRANSFER_CHARACTERISTICS_GAMMA22

Loads a tone mapping (3D LUT) metadata from lut3d_file and inject it to input_file(.mov or .mp4). The specified output_colour_primaries and output_colour_transfer_characteristics are injected too. It saves the result to output_file.
input_file and output_file must not be the same file.

Examine

python lut3d_utils -retrieve_lut3d -i ${input} -l ${lut3d_file}

Checks if input_file contains 3D LUT metadata. If so, parses the metadata and prints it out. In addition, it saves the 3D LUT entries to lut3d_file as a ".cube" file.

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soooooo .... in theory you can use those for injecting and exporting those 3d luts in mp4/mov ..

I wonder if ffmpeg/libavformat can be teached to do this, too?