> An absolute color space exists. It's called XYZ. We could use it. Some image formats support it.

XYZ is really annoying to work in though. ACES is a pragmatic solution here, quite literally: https://blog.frame.io/wp-content/uploads/2019/09/ACES-APO.jp...

Okay, fair enough two out of three primaries are imaginary colors, but nobody said you have to use the whole color space when your processing pipeline is meant to be using 32 bit floats. Delivery formats might want to be using a more real color space.