Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
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Iliah Borg
Forum ProPosts: 18,473
Re: Maybe this will help.
In reply to crames, Feb 21, 2014

crames wrote:

Only if you know how to convert to XYZ, where Y is luminance. CIE states that brightness is relative luminance. Relative luminance is defined as photometric luminance normalized to 0..100 in such a way that reference white is 100.

No, Brightness is an absolute percept,

Subjective absolute You do not know brightness, you can only say which one is brighter. Forget absolute.

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