Re: color perception differences between eyes

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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