Re: color perception differences between eyes
Re: color perception differences between eyes
- Subject: Re: color perception differences between eyes
- From: Marco Ugolini <email@hidden>
- Date: Sat, 25 Jul 2009 17:08:38 -0400 (EDT)
John Castronovo wrote:
>From: "C D Tobie"
>> On Jul 21, 2009, at 4:04 PM, Bob Frost wrote:
>>> Have I missed something?
>>
>> Only that more further testing, on more diverse groups, did not
>> significantly change the results...
>
>Proving that our adaptive visual system nulls out any differences in the
>brain where vision takes place, and the same thing happens by averaging
>the differences between right and left eyes. Like most people, I had
>different color perception between my eyes for most of my life (for some
>strange reason I no longer have this), but if I looked through either on
>it's own long enough, it would adapt to showing the 'correct' color,
>thus exaggerating the difference when I'd switch to the other eye. When
>both eyes are being used and I quickly shift from one to the other,
>there'd be less difference between them. I suspect that in the end, it's
>all about the same once the brain adjusts the signal it's getting to a
>comfortable white point. Pretty freaky to be in this business and know
>this is happening, but that's why we use measurement tools to help.
Well said, John. The way I understand it, the 1931 Standard Observer is an attempt to model and describe the end results of the work done by the human visual system -- which takes the external visual stimuli and makes them into sensations that most humans share, to a large extent and barring pathology in the individual that interferes with this mechanism's "proper" functioning.
Measurement tools are predicated on that model of "proper" functioning. Though many are quick to point out the weaknesses of this colorimetric model, in reality it works amazingly well in our daily imaging endeavors, specially when one considers the alternatives -- all of them far costlier, considerably more time-consuming, more often than not proprietary and technically even more complex.
It's that "proper" functioning (defined in statistical terms) that I see described in the type of color science involved in the building and use of ICC profiles in our imaging work. Unless someone cares to point out why this POV should be considered untenable, I would say that too much is being made of differences in the way a given individual's eyes differ from another's -- again, barring *pathology*, which is another subject altogether.
Marco
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