Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
crames Regular Member • Posts: 192
Re: Maybe this will help.

bobn2 wrote:

crames wrote:

bobn2 wrote:

crames wrote:

bobn2 wrote:

If 'brightness' is dependent on 'absolute luminance of the stimulus' then there is no such thing as 'ISO'.

Ok, I'll bite. How so?

How does brightness figure into this? That is, CIE brightness, or are you using another definition?

I don't see how the connection between luminance and brightness would cause there to be "no such thing as ISO."

You can calculate a brightness for an sRGB value of 118, since the viewing conditions are defined and you have enough info to plug into a CIECAM02 calculator.

What would be the brightness for an sRGB value of 118, in candela per square metre?

CIECAM02 brightness correlate Q of the 8 bit sRGB value (118,118,118), Q=102.28.

Candelas per square meter are the units for luminance, not the unit-less brightness, so your question doesn't make sense.

You're obviously fishing around for something, without explaining how brightness, that is CIE brightness as discussed in this sub-thread, has anything to do with the existence or non-existence of "ISO."

By the way I can recommend an excellent book on color, The Reproduction of Colour by R.W.G. Hunt.

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