Digital BW, The Print

Bob writes:

> Since everyone's eyes differ - their lenses will
> vary in many parameters (just as our camera lenses do),
> their retinas will differ in the number of color sensor
> cells, their proportion, their connections to the
> optic nerves, and then the brain circuitry that receives
> the signals from the retina will also vary from
> person to person ...

The physiology of human vision is extraordinarily consistent.  That's how we
know that 6-8 megapixels is all that anyone ever needs for a full-frame
image (even with perfect vision, it's not possible to see much more than
that).  That's also how we are able to develop accurate color models and
color reproduction.  If there were even slight variations among individuals,
no two people would ever see anything in the same way by even a wide margin,
and many visual technologies we have today would be useless.

Indeed, the limits of visual acuity are some of the best established data we
have in the visual domain right now, and they are not changing.