way to create film emulation LUT files

i’d like to feature not exactly the application, but the process.

i don’t know if anyone else used such a process to create LUT files.

the part with using prints instead of negative scans may be arguable. but overall i am just amazed by this project, unfortunately it works only on apple hardware.

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actually my friend reverse engineered those by using darktable and colorchecker, and those reverse engineered luts produce results very much like dehancer, but with some blue/cyan, everywhere.
so i created xmp files for myself that are applying those luts and then decrease cyan saturation, and use those in batch processing, but i don’t know if he made something wrong with the reverse engineering process.