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: Mon, 22 Jul 2024 06:07:19 +0000
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- Thread-topic: Why 2 degree observer measurements for ICC profiles?
Thanks Graeme, and everyone for your responses. A lot of food for thought.
Reflik
I had a looked at the “Individual Colorimetric Observer Model” paper, however I
don’t have a training in color science to fully grasp the significance of what
I am reading.
Is there a way of qualifying what sort of size colour differences these
observer variations are causing in the normally sighted population?
If they were all looking at the same objects in a viewing booth, what sort of
magnitude of potential colour differences would they be seeing?
FYI: A few years ago I had a lens replaced in one of my eyes and so I now have
two quite different ‘observers’ when it comes to assessing colour.
Thanks
Peter Miles
From: Graeme Gill via colorsync-users <email@hidden>
Date: Friday, 19 July 2024 at 8:49 PM
To: ColorSync <email@hidden>
Subject: Re: Why 2 degree observer measurements for ICC profiles?
Peter Miles via colorsync-users wrote:
> So why do ICC profiles, for print production, still use 2degree observer
> measurements instead of 10 degree observer measurements?
A standard often has a momentum of its own. But in the case of color in media
that is looked at in detail (such as images), 2 degree is appropriate.
AFAIK, one of the reasons that the 10 degree observer is often recommended is
that it was created with more observers and in a more refined way, and is
technically
a bit more accurate. In subsequent experience it has often turned out that the
10 degree standard matches people more accurately than the earlier 2 degree
observer, even though it is not the appropriate viewing angle.
Note that there are many subsequent more refined standards or proposed standards
such as the 2012 2 and 10 degree observers. These are not in widespread use
though,
whereas every graphic arts instrument will return 1931 2 degree values.
And of course there is nothing to stop you making ICC profiles using any
observer you like :-) They may not be technically interchangeable with
profiles using the 1931 2 degree observer, but that matters less in practice,
and not at all if all the profiles you use use the same observer.
Cheers,
Graeme Gill.
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