Perception and measurement
Perception and measurement
- Subject: Perception and measurement
- From: Paul Foerts <email@hidden>
- Date: Fri, 07 Nov 2008 21:34:11 +0100
On Fri, 07 Nov 2008 07:03:03 -0500 Roger Breton <email@hidden> wrote:
> Hi Klaus,
>
>> Yes, but even then our senses are right, but maybe the quantities and
>> models to quantify the sensations are wrong or inappropriate.
>
> At that CIE Expert Symposium, in Ottawa, Canada, a few years ago, where you
> and I met in person, 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?
>
> 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...
>
> MfG / Roger
Roger,
The instrument you describe is an "anomaloscope". I suppose all "color
science institutes" have one or more.
Pilot candidates are confronted with this apparatus when they have to pass
their secondary color blindness test.
I'm not advocating this test for printers too. :-)
I took the oportunity to test my vision at the BAM in Berlin - during some
color workshops, more than 10 years ago.
For those interested: my vision was inside normal viewing tolerances for a
person of my age...
Paul
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