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: Tue, 23 Jul 2024 10:28:43 +1000
Peter Miles via colorsync-users wrote:
> 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?
In some numerical simulations I've done, this depends heavily on how narrow
band the
colors are. Make them very narrow (such as lasers) and you can expect extreme
differences in perceived color (I saw of the order of 30 dE for some observer
pairs).
Of course a print evaluation is the least provocative situation since typical
colorants
used on paper have relatively mild transitions vs. wavelength. This is why
reflective
and transmissive media that uses typical pigments or dyes has smaller gamuts
than
emissive displays or interference effects filters.
> 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.
How different this will be in practice depends on how "bumpy" the difference in
the transmission spectra of your two lenses are. A smooth difference will amount
to a change in white point, but is less likely to change what you regard as
a colorimetric match. More rapidly changing differences could have some effect,
depending on the coincidence between those differences and the transition
bands of the color stimulus.
Cheers,
Graeme Gill.
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