Re: Metamerism vs Color Inconstancy, again
Re: Metamerism vs Color Inconstancy, again
- Subject: Re: Metamerism vs Color Inconstancy, again
- From: Marco Ugolini <email@hidden>
- Date: Wed, 16 Jun 2010 20:31:07 -0700
- Thread-topic: Metamerism vs Color Inconstancy, again
In a message dated 6/16/10 6:02 PM, Graeme Gill wrote:
> Marco Ugolini wrote:
>> I'm not sure what you mean by "inverted", but the whole point of my
>> endlessly distorted and misunderstood messages is to individuate, define and
>> separate the two distinct, though related, concepts of "color constancy" and
>> "metamerism" (that must be the nth time that I emphasize the point that they
>> are distinct though related, but not equivalent...maybe one day it will
>> register!).
>
> Well Marco, you seem to have ignored my point - which "Color Constancy"
> are you referring to ?
>
> Graeme Gill.
"Related to metamerism is COLOR CONSTANCY, the tendency of an object to
maintain its color despite changes in illuminating conditions. Each object
forming a metameric pair has a different DEGREE OF COLOR INCONSTANCY. For
example, the right-hand square [of two squares viewed under one illuminant
-- MU] will turn pinkish when illuminated by incandescent illumination,
whereas the left-hand square tends to remain grayish. Although both samples
match under daylight and are thus a metameric pair, only one sample of the
pair exhibits objectionable color inconstancy. If both formulations [both
specimens -- MU] are candidates as a color standard, the sample that
minimizes the degree of color inconstancy would be preferred."
Roy Berns, "Billmeyer and Saltzman's Principles of Color Technology", Third
Edition, Wiley & Sons, 2000, page 29
It's all there: the distinct notions of metamerism vs color
constancy/inconstancy, and their correlations too.
Not much else I could add if that is not clear.
Marco
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