Originally posted by Quackdoc
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e.g. lets say instead of 1 nit for the lowest value of 255:1 you use 0.3 nits
all of your other spacings now have to increase to 1.0028 nits per level and your dynamic range is now 255:1.0028 < 255:1
254*1.0028+0.3=
255:max(0.3,1.0028)
Just like perpetual motion, it doesn't matter how you try and fake it, you can't put more information into 8 bits than 255 levels, dynamic range and bits measure the same properties of information, but ones analogue, the other is digital.
That, btw, is exactly how you downscale the "real world" with generally a 1,000,000:1 dynamic range, to an SDR image with a 255:1 dynamic range, and why darks/lights end up "washed out" depending on which end of the scale you clip on.
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