Why 'more or less stopped using ISO'?

Started 8 months ago | Questions thread
crames
Regular MemberPosts: 192
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Re: Maybe this will help.
In reply to bobn2, 8 months ago

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?

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Bob

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?

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Bob

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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