Re: 2 degree vs. 10 degree
Re: 2 degree vs. 10 degree
- Subject: Re: 2 degree vs. 10 degree
- From: email@hidden
- Date: Sun, 9 Feb 2003 10:19:38 EST
In a message dated 2/9/03 3:27:06 AM, email@hidden writes:
>
The LAB debate has caused me to think of yet another possibly "more
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interesting than useful" topic. Everything in ICC-based color
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management is 2-degree, D50 LAB (for output profiles) and I've always
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wondered why we use 2-degree and not the newer 10-degree Standard
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Observer data. Annex A of the ICC spec says the PCS is to be based on
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the 2-degree Standard Observer.
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>
What little I've been able to find on 2-degree vs 10-degree generally
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says that 10-degree is considered to be better (better for what is
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somewhat unclear), and some sources say it's more common. But not in
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ICC-based color management.
We aren't speaking of sperical spectros, but of 0/45 degree devices, where a
10 degree observer would turn them into 0/40-50 degree devices, adding
increased effect from texture and sheen, instead of simply color. Since
simplifications in the ICC process are looking for the color, not the color
in relation to shadow and sheen, this would make for undesired complexity and
variation in the results.
C. David Tobie
Design Cooperative
email@hidden
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