Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: Roger Breton <email@hidden>
- Date: Mon, 03 Sep 2007 14:53:05 -0400
Marco, Ray, Martin and others,
Just to drive the point home, for myself and possibly others.
In Markus's case, since he's not comparing the appearance of two colored
objects (a photographic prints and some other colored surface) across
various light sources, this effect cannot belong to a class of visual
phenomenon called "metamerism", right?
I like your definition below ;-)
> *Metamerism* is the effect whereby *two* colored objects built with colorants
> of different spectra appear to match one another colorimetrically under a
> given illuminant. It's a *positive* effect, not one that should be avoided.
> Without metamerism, the only way to match a target color would be to create it
> with exactly the same pigments and materials.
Again, in Markus's case, since he's comparing the change in appearance of a
single colored object (his photographic print) viewed under various light
sources, this effect properly belongs to a class of phenomenon called color
inconstancy, right?
I like your definition below again ;-)
> On the other hand, the phenomenon whereby a colored object changes appearance
> under different illuminants is called *color inconstancy*.
>
> This distinction may seems like nitpicking to some, given how used we have
> become to hearing "metamerism" used in place of "color inconstancy" even from
> people who ought to know better -- but it's not, since the two expressions
> actually indicate two sharply distinct phenomena.
>
> Marco Ugolini
Regards,
Roger Breton
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