I've been fascinated by this explanation on how calibration was done for film distribution with inevitable deviations due to the analog nature of the process.
In this video, +CineTechGeek shows it consists in calibrating essentially the primaries coordinates. I wonder what the response curve is tho: I suppose essentially linear with a rolloff in highlights?
Cool stuff, I'll watch more or those videos to continue learning about it 😊
Via +wolfcrow