Re: Metamerism vs Color Constancy
Re: Metamerism vs Color Constancy
- Subject: Re: Metamerism vs Color Constancy
- From: Marco Ugolini <email@hidden>
- Date: Tue, 20 Sep 2005 13:17:13 -0700
In a message dated Tue, 20 Sep 2005 07:23:37, Roger Breton wrote:
>> I've been saying the same on several lists for the last year or so but
>> getting nowhere. To most people now, metamerism means color change in
>> different light (i.e. color inconstancy), unfortunately.
>>
>> Bob Frost.
>
> But it's true that there is such thing as "illuminant metamerism", the
> change in color appearance caused by a different source of light which
> causes two surface colors not to match anymore.
True, Roger. Illuminant metamerism is a fact. But according to a proper
definition of "metamerism" you can only have a metameric MATCH or a
metameric FAILURE between TWO (or more) samples.
So, illuminant metamerism can be observed when TWO identical copies of a
print (same inks, same spectral compositions) are shown nest to one another
in a light booth, separated by a divider, and each under a different
illuminant (say, one under illuminant A, the other under illuminant D65). In
that case one can say that you are observing a metameric failure, because
the TWO appear different from each other.
But if ONE print is seen under a certain illuminant and then taken to a
place with a different illuminant, can it properly be said that what has
happened is a metameric failure of that print WITH ITSELF?
That would not be right, would it?
--------------
Marco Ugolini
Mill Valley, CA
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