Re: =Color constancy and metamerism
Re: =Color constancy and metamerism
- Subject: Re: =Color constancy and metamerism
- From: Robin Myers <email@hidden>
- Date: Tue, 20 Sep 2005 14:47:30 -0700
On Sep 20, 2005, at 14:04, Ken Fleisher wrote:
On Sep 20, 2005, at 4:53 PM, Mark Rice wrote:
I don't think so - metamerism can occur with a single sample.
That's not correct. Metamerism, by definition, requires two samples.
Your example of the dress and it's photo reproduction is correctly
considered metamerism. You have two samples--the dress and the
reproduction! Poor example to make your case. ;-)
Actually, for the example of observer metamerism, which is the effect
with the dress and the film, only a single sample is required because
there are two observations. There is always a pair of somethings;
samples (two illuminants, one observer), observations (single
illuminant, two observers), angles (one sample, one observer, two
orientations).
The issue of observer metamerism as it relates to digital photography
is a subject I have extensive experience with and there is a paper,
"Color Accurate Digital Photography of Artworks" on my website,
www.rmimaging.com, that shows the science behind the issue and a
solution for the digital camera (make it see like a human). This same
technique has been used for several years by many clothing, fine art
repro and product photographers to solve the issue of observer
metamerism failure.
Robin Myers
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