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Easily doable on non-Apple displays.

(a) Buy a high brightness monitor. There are some industrial ones that go up to 1000, 2500, or even 5000 nits. A Dell U2723QE, for comparison, is 400 nits.

(b) Scaling back ALL RGB pixel values linearly from [0,255] to [0,127]. Actually, just bit shift them.

(c) Set monitor brightness to 100%, which cancels the effect of (b) under most circumstances.

(c) When you want a dose of "Apple HDR" white you just issue a [255,255,255] and you get a blast of 1000 nits in your face.

In fact I think a lot of newer monitors offer 10 bits per pixel of depth, and considering most images on the web are still 8 bits per channel, you can do all of the above without even losing color resolution from 8 to 7 bits, and instead go from 10 to 9 bits, though I don't know how to implement that in practice (might have to be done on the graphics driver level rather than scaling down pixel values in the OS?)



This sounds to me like it would be a very poor approximation of how EDR works on Apple displays.




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