P3D crosseye jps advantage

[John Toeppen <toeppen@xxxxxxxx>]

Homer wrote: "I can so if I do a lot of parallel free viewing
I try to compensate with equal amounts of cross viewing....  Its a good
idea to encourage people to learn and use both methods rather than just
one."

I generally agree that it is good to learn how to do anything.  However,
parallel viewing of images separated by more than 65 mm center to center
never occurs in natural viewing circumstance.  If an image must be
viewed walleyed (say edge to edge on a monitor) learning to diverge this
far comfortably does not seem like a great help in life.  One man I know
has a permanent tint in his vision that he believes came from extensive
use of anaglyph eye wear for comics in his youth.  The cumulative
effects of weird viewing are difficult to predict.

A red button viewer is designed to recreate the convergence and some of
the accommodation of the actual scene.  This allows comfortable viewing
with very low fatigue.  Poorly mounted slides having vertical offsets or
rotated images will induce fatigue rather quickly. Any degree of error
produces potential degradation of the perceived credibility of the
image.

Crosseye viewing of a full width image on a monitor is equivalent to
viewing an object four inches from your
nose.  While this is not a "normal condition" one can learn to quickly
converge to view an instrument panel and look back at the road with
ease.  Learning to rapidly converge seems like more of an advantage, is
easier, and is certainly less pain.

Crosseye viewing is also suitable for viewing full page prints of jps
images.  The size and resolution is always going to be better with
crosseye.  Thus crosseye viewing is my preferred "hardware free viewing"
method.

John Toeppen
crosseye and jps images at:
http://members.home.net/toeppen/index2.htm