Re: perception and measurement [was: G7 press calibration, best press conditions or average?]
Re: perception and measurement [was: G7 press calibration, best press conditions or average?]
- Subject: Re: perception and measurement [was: G7 press calibration, best press conditions or average?]
- From: Klaus Karcher <email@hidden>
- Date: Fri, 07 Nov 2008 14:04:23 +0100
Roger Breton wrote:
At that CIE Expert Symposium, in Ottawa, Canada, a few years ago, where you
and I met in person,
Unfortunately we didn't. I never was in Ottawa.
I remember running in Mark Fairchild, in the corridors,
and asking him the million dollar fragen "does the Standard Observer
actually works", is that the source of our (matching) problems? To which I
remember he replied: the Observer does arbeit, he said, *on average*. So,
our eyes are what they are and there is no absolute guarantee that, if two
colors are a match for our instruments, that it will also be a match for our
eyes. But, on average, he insisted, they would. I've always meant to test
how far my own color matching functions are from the Standard Observer... At
one of the local universities, here, in Montreal, there is a professor at a
school of ophthalmology / optometry that uses, in his office, an apparatus
designed to characterize a person's color matching functions for vision
research. There is a head rest and then there is a monochromator that shines
all spectrum colors in one half of a bipartite field, and the observer has
to match the spectrum colors being presented using three chosen primaries.
After completing the procedure, it's possible to tell how far the person is
from some given set of color matching functions. Have you seen such a
machine in Deutchland?
No, not yet. I attended a workshop at the University of Aachen (Germany)
few weeks ago and become acquainted with Prof. Hill's works on
soft-proofing devices. Inter-observer differences are a common issue in
his work. In the end his experimental soft-proofing station has to be
adjusted to every single person when it's about highly accurate assessment.
This being said, I hear talk that the CIE would abandon the Standard
Observer in favor of some flavors of Cone Fundamentals? Is that true? I'm
sure I read this somewhere not too long ago and it stroke me as an important
development in color science...
I once read a paper to mark the 75th anniversary of the Standard
Observer (I forgot about the author, it's quite possible that it was
Mark Fairchild). It contained the provocative question whether it's time
to send the Standard Observer into retirement. The answer was no as the
scientific community is still searching for a worthy successor.
Klaus
--
Klaus Karcher * Eichenallee 18
26203 Wardenburg * Germany
Tel. +49 441 8859770
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