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Tue Dec 22, 2020 8:22 am
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Last edited by brianholmes37 on Thu Oct 28, 2021 4:22 am, edited 2 times in total.
I think you're confusing two issues here.
One is the big Quicktime gamma topic that is thoroughly explained here:
viewtopic.php?f=21&t=101253&hilit=quicktime+gamma
And a color monitoring vs delivery vs viewing environment/software problem that's concerning your iMac 5K.
This monitor should never be used for color accurate work as it is not hardware calibratable and can't be limited to output delivery formats in a proper manner.
It's displaying P3 with D65(one that tends to be much more magenta visually) in 2.2 gamma.
This is pretty much nonexistent for any deliverable and it's also very sloppy calibrated from my experience.
Don't work in 709 and just tag it as P3 you're only trying to fix everything wrong with how Apple's ecosystem is working from your computer's perspective.
Get a dedicated proper 100% rec 709/sRGB monitor if you want to deliver for web and keep the image pipeline according to those specs.