Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: "Fleisher, Ken" <email@hidden>
- Date: Tue, 04 Sep 2007 07:48:43 -0400
- Thread-topic: Neutral grey under different lighting
Graeme,
I normally agree with everything you say, but in this case I think you are
mistaken:
A metameric mismatch can only occur between two metameric colors. That is,
they must match under one illuminant but not another. Non-metameric colors
are either 1) the same identical color (i.e. SPD) so that they match in
every condition or 2) they never match. (Okay, parametric colors "almost"
match, but technically that's still not metamerism.) Therefore, they cannot
produce a metameric mismatch as you suggest.
Metameric failure is simply when a metameric pair does not produce a match
under a particular viewing condition--I've never heard of it described in
relation to whether it is "intended" to produce a match or not, it simply
doesn't.
Your summary also implies that you should only call two colors metameric
under the condition where they match, but a metameric pair is still a
metameric pair no matter what conditions they are observed under and whether
they match or not.
On 9/3/07 10:40 PM, "Graeme Gill" <email@hidden> wrote:
> I'd tend to put it like this:
>
> For metamerism:
>
> Match: Metameric colors
> Mismatch: Non-metameric colors
> Mismatch where a match is intended: Metameric failure.
>
> Graeme Gill.
--
Ken Fleisher
Photographer
Imaging & Visual Services
National Gallery of Art
Washington, D.C.
Phone: (202) 712-7471
email@hidden
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