[argyllcms] Re: Fw: Re: Correction for wide gamut screens and/or RGB-LED?
- From: Juergen Lilien <jp.lilien@xxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 28 Aug 2010 04:51:04 +0200
Roger Breton wrote:
> I think the German Fogra document means "under imperfect adaptation".
> Are they referring to the "imperfect adaptation of the obverver"? When
> observing the display?
The translation of the headline is:
"Why is there not always a perfect match between display measurements
and visually perception?"
One of the four reasons they discuss is "observer metamerism".
They explain that the „CIE 1931 2° standard observer",
according to recent studies, is not describing the average of
emmetropic (color-normal) human observers. There is a lot of fluctuation
in the spectral sensitivity of the retina between persons, so the
derived standard observer curves are also fluctuating (Abb.3 shows 24
observer curves). This is the reason for "observer metamerism", which
describes the problem that a human observer is able to perceive two
colors as different even if the colorimetric match is achieved.
I found one more interesting text on the subject:
MODERN DISPLAYS: A CHALLENGE TO TRADITIONAL COLORIMETRY,
AN OPPORTUNITY TO MOVE BEYOND THE STANDARD by Sarkar, Abhijit:
http://edstim.univ-nantes.fr/jdoc2010/USB-JDOC2010/sources/ARTS-Abhijit-SARKAR-Article.pdf
(^copy in one line)
The concept for classifying color-normal observers in categories
is interesting. It would be great to have the option to select
the individual best fitting observer in ArgyllCMS. But to do so
you have to know your category, which requires the implementation
of a test procedure.
But even in this text the 10° standard observer is mentioned as
a reasonably good match for the average observer.
In spotread it is possible to change the observer (option: -o observ)
from the default 1931_2 to 1964_10. There seems to be no option in
dispcal to change the observer, so does it also default to 1931_2?
Is it possible to implement the option to change the observer
in dispcal (minor problem: "-o" is already used)?
>> -----Original Message-----
>> From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-
>> bounce@xxxxxxxxxxxxx] On Behalf Of Juergen Lilien
Ups, "bounce"? Is there something wrong with my posts?
Regards, Juergen
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