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 12:14:27 -0700
In a message dated Tue, 20 Sep 2005 09:25:25, Danny Pascale wrote:
> A more likely case for both metameric match and color
> inconstancy would be for two shades of a color (I have
> measured this for kaki green paints of the same
> manufacturer for instance). You can look at this screen
> shot that illustrates this example:
> http://www.babelcolor.com/main_level/screen_shots/Spectral_Tools_MI.htm
>
> Since the two shades are made of the same pigments, there
> is basically no metameric effect between the two (i.e. the
> color relation or color difference remains the same for
> various illuminants). However, these colors can be color
> inconstant and become "browner" when seen under D50
> relative to tungsten (Ambient 2775 K). Since they both
> become "browner" at the same time, the relative hue,
> saturation and brightness difference is about the same.
>
> I hope this makes it clearer!
Yes, Danny, I think it does, and I thank you for taking the time to explain
this to me.
If I can try to draw a conclusion from what you say, then, when we refer to
the change in appearance of a print under different illuminants it would be
more appropriate to say that that specific print is "color inconstant."
Compared to you and other "color monsters" on this forum, my color science
is certainly more than a bit weeny: all the more reason for me not to
compound my relative ignorance by misusing the terminology. That's why I
sincerely thank you for clearing this one up for me.
--------------
Marco Ugolini
Mill Valley, CA
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