> ~"1.07 billion colors" though? Ehhh, I can't deny that does feel like overkill, but I'm honestly not even sure if there's a way to fix the above problem with a smaller colorspace.

Given that we're starting with 24 bits / 16.7 million, we're just up 6 bits more.. or 2 more bits per color... so a purely red gradient would have 4x as many steps.

And we're using some of that space to get "whiter than white" -- so that the brightest white in photos/videos can be brighter than the normal value of white. https://www.lifewire.com/how-apple-devices-show-hdr-brighter...