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> #000000 means 0.1 nits, #ffffff means 100 nits. That's standardized and specified.

Uhm, scree brightness control is a thing. Adaptive brightness is standard even on non high end phones. Same for desktops etc.

So a part of a standard which maps color to specific brightness levels is pretty much irrelevant outside of the unrealistic case of a perfect calibrated monitor in a perfect environment. Which does exist. But again is for most internet users unrealistic.



> So a part of a standard which maps color to specific brightness levels is pretty much irrelevant outside of the unrealistic case of a perfect calibrated monitor in a perfect environment. Which does exist. But again is for most internet users unrealistic.

If you modify the brightness in software, you can also tonemap it properly and retain the contrast easily.




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