Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
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Luke Kaven Veteran Member • Posts: 5,692
Re: Maybe this will help.

Iliah Borg wrote:

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.

Yes.  As Wittgenstein would say:  You already know what it means.

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