Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: Bernhard Barkow <email@hidden>
- Date: Tue, 4 Sep 2007 08:28:04 +0200
[Sorry, this post was originally not directed to the list but only
one address]
Hi,
first, I'm relatively new to this list, but find discussions like
this highly interesting. A precise formulation of the problem is
always a key part of the solution…
On 2007-09-04, at 01:37, Andrew Rodney wrote:
Negative. These prints exhibited huge color "inconstancy", the
ability to
change appearance under different light sources, like a chameleon
against
different backgrounds.
It appears the language is such that metamerism is used in cases of
matching
color appearance while color inconsistency is used in the opposite
case, no?
In addition, there's one or two pairs of color samples used.
Metamerism is
always about two samples. The moving print is just one.
Just to throw my 2¢ in: would it be absurd to reduce that further and
say that color inconstancy is a metameric failure of one sample (the
printed gray gradient) compared to a virtual second sample (e.g. the
Kodak gray card)? After all, the perception can only judge
relatively, i.e., as far as my experience goes, it's hard for the eye/
brain to recognize an absolute gray.
This all apart from the actual cause stemming from the fact that
fluerescent light (as was already pointed out) usually has a line
spectrum, which will almost certainly result in perceptual color
shifts compared to a continuous spectrum (like sunlight). (Metameric
failure for almost all possible combinations of color patches;
democratically (the majority rules), one should almost talk about
"illuminant failure" in such a case…)
Just a thought.
Bernhard
On 2007-09-03, at 00:21, Nov06 wrote:
What I have noticed is that the prints looks more or less neutral
at daylight (between 5000 and 7000 K according to my Eye-One) but
have a pinkish/magenta-ish cast when viewed under normal
fluorescent office light
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