Re: Why 2 degree observer measurements for ICC profiles?
Re: Why 2 degree observer measurements for ICC profiles?
- Subject: Re: Why 2 degree observer measurements for ICC profiles?
- From: Refik Telhan via colorsync-users <email@hidden>
- Date: Thu, 18 Jul 2024 11:36:50 +0300
- Thread-topic: Why 2 degree observer measurements for ICC profiles?
Yuta Asano’s work Individual Colorimetric Observer Model
(https://doi.org/10.1371/journal.pone.0145671) co-authored by Mark D. Fairchild
and Laurent Blondé clearly points to one basic fact: we all have different CMFs.
Any standard observer at any FOV will just be representing only few of us.
“Averaging” thousands or even millions of real observers will not make things
any better. The calculated CMFs will only represent few real observers.
Illuminant metamerism and its lesser known sibling observer metamerism will
always be with us.
The second paragraph of the abstract on CIE’s page on “CIE Standard
Colorimetric Observers”
(https://cie.co.at/publications/colorimetry-part-1-cie-standard-colorimetric-observers)
says it all:
“It has long been the practice in colorimetry to make use of sets of
colour-matching functions to calculate tristimulus values for colours: equality
of tristimulus values for a pair of colours indicates that the colour
appearances of the two colours match, when they are viewed in the same
conditions by an observer for whom the colour-matching functions apply.”
We know the shortcomings of the current standard observers. Replacing them with
others will not make things any better.
Refik Telhan
-----Original Message-----
From: Mark Stegman via colorsync-users <email@hidden
<mailto:email@hidden>>
Reply-To: Mark Stegman <email@hidden <mailto:email@hidden>>
Date: 18 July 2024 Thursday 02:10
To: Kneringer Clemens <email@hidden <mailto:email@hidden>>
Cc: <email@hidden <mailto:email@hidden>>
Subject: Re: Why 2 degree observer measurements for ICC profiles?
Some references on the origin of the Standard Observer. The first is easily
digestible. The second, official source (CIE) is more detailed.
Note the standard was revised in 1964 to the 10 degree specification with
no tangible effect on the results (as I read it). Those on this forum with
more technical expertise may like to expand.
https://support.hunterlab.com/hc/en-us/articles/203420099-CIE-Standard-Observers-and-calculation-of-CIE-X-Y-Z-color-values-AN-1002b
<https://support.hunterlab.com/hc/en-us/articles/203420099-CIE-Standard-Observers-and-calculation-of-CIE-X-Y-Z-color-values-AN-1002b>
https://cie.co.at/publications/colorimetry-part-1-cie-standard-colorimetric-observers
<https://cie.co.at/publications/colorimetry-part-1-cie-standard-colorimetric-observers>
Mark Stegman
On Thu, 18 Jul 2024 at 02:36, Kneringer Clemens via colorsync-users <
email@hidden <mailto:email@hidden>> wrote:
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