Re: Perception and measurement
Re: Perception and measurement
- Subject: Re: Perception and measurement
- From: Steve Miller <email@hidden>
- Date: Fri, 07 Nov 2008 14:42:41 -0500
- Thread-topic: Perception and measurement
Here's a link from xrite that some of you may not have seen yet.
Test your color IQ here...
http://www.xrite.com/custom_page.aspx?PageID=77
On 11/7/08 3:34 PM, "Paul Foerts" <email@hidden> wrote:
> 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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