P3D Re: anaglyph glasses and permanent colour shift

[kiwi1957@xxxxxxxxxx]

>  Date: Sun, 13 Feb 2000 19:05:23 -0500 (EST)
>  From: Robert Cruickshank <robcruic@xxxxxxxxxxxx>
>  To: photo-3d@xxxxxxxxxxxxxxxxx


>  I have
>  convinced myself that it's only a coincidence that this matches the
effect
>  of wearing the (red-on-right) "Deep Vision 3D of Hollywood" glasses. I
>  wonder, now, though, how much do peoples eyes vary? 

One's perception of color balance will shift throughout the day. The color
balance that one perceives when they first wake up will be different later
on in the day. Drinking a cup of coffee or eating some food can cause subtle
shifts in color perception too. Remember "green screens" on computers in
ancient times, say 10-20 years ago? Some were amber and some were green, but
I remember having some extreme shifts in my color perception after having
viewed one of these displays, especially at night when I was driving home
after a long day at work in front of one of those two tone tubes.

And if you've ever worked in a lab, you don't always have a point of
reference in judging color balance as you move from room to room. Something
that you thought was perfectly balanced in the morning might appear
off-color later in the day. Besides consumption of food and beverages, the
effect of daylight and the position of the sun and clouds can impact what
you think might look "magenta" or "yellow" or "cool" biased. 

When someone reports that film "X" is magenta and film "Z" is green, I can't
help but wonder of the myriad of variables that come into play:
- hourly fluctuations in human perception
- time of day
- environmental conditions (indoor lighting, outdoor influences)
- film emulsion variations
- film processing lab variations
- film storage variations (before and after exposure and the time length
between exposure and processing)
- paper emulsion variations
- paper processing variations
- deterioration of the original processed film
- deterioration of human eyesight over time
- viewing methods (direct and/or reflective lighting sources)
- differences in perception from person to person
- differences in preferences and pure biases from person to person 





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