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: Graeme Gill via colorsync-users <email@hidden>
- Date: Fri, 19 Jul 2024 18:49:01 +1000
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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