poita said: (snipped)
It is based on this technique http://www.mudgee.net/ot/colourgrading.pdf
The basics are here: https://originaltrilogy.com/topic/Colour-matching-for-fan-edits/id/7257/page/1
Hope that helps!
Thank you for the info and the links. I hadn’t realised the underlying algorithm was iterative until reading those guides.
Bluto