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: Peter Miles via colorsync-users <email@hidden>
- Date: Tue, 16 Jul 2024 20:56:35 +0000
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- Thread-topic: Why 2 degree observer measurements for ICC profiles?
Thanks for the explanation Claas!
Peter
From: Claas Bickeböller via colorsync-users <email@hidden>
Date: Tuesday, 16 July 2024 at 7:22 PM
To: Colorsynclist <email@hidden>
Subject: Re: Why 2 degree observer measurements for ICC profiles?
Hi Peter,
The difference between the 2° and 10° observer is basically the size of
the area on your retina that is stimulated.
For the 2° observer mainly the cones in the center of the retina are
stimulated while for the 10° observer also the rods are stimulated.
That leads to a difference in color perception.
Here is a quite nice visualization:
https://santhalakshminarayana.github.io/images/color-science/standard-observer.jpg
The type of application when our perception is like a 2° observer or a
10° observer respectively is closely related to the viewing distance.
When you look at a printed product from a typical viewing distance of
50-60cm the field of view is close to 2°.
That's why for ICC profiles that are mainly used for print applications
the 2° observer is the standard.
When you look at other products like let's say a painted wall the filed
of view is close to 10°.
The wording on our website is a little misleading I must admit.
Most of our industrial products are used for applications where the
viewing distance leads to a field of view where the 10° observer
correlates better than the 2° observer.
BTW, when you want to check if in a certain situation "you are" the 2°
or the 10° observer there is a simple test.
Stretch out your arm, thumb upwards and look at your thumb with one eye.
The area that is covered corresponds to approximately 2°.
If the area can be covered with the entire fist, this is approximately 10°.
Best regards
Claas
Peter Miles via colorsync-users schrieb am 16.07.24 um 04:13:
> Hi list members.
> Hoping some color science folk out there on the list could help answer a
> question I have.
>
> From Konica Minoltas web page titled “Understanding standard observers in
> color measurement”
> “CIE standard observers help correlate instrumental color measurements to
> human visual assessments. The 1964 10 Degree Supplementary Standard Observer
> is considered to be more representative of how the human eye perceives color.”
>
> So why do ICC profiles, for print production, still use 2degree observer
> measurements instead of 10 degree observer measurements?
> Given that the 10 degree observer “is considered to be more representative of
> how the human eye perceives color. (me: Than 2 degree observer)”
>
> Thanks
> Peter
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