Re: Nimslo Prints vs Slides

[crowell@xxxxxxxxxxxxxxxxx (Jim Crowell)]

At 10:18 AM 2/28/96, John Bercovitz wrote:

>> But don't forget the itty bitty baseline (well, smaller than a
>> Realist, anyway).  I can't imagine stretch would be too much of
>> a problem, perceptually speaking...
>
>Ah, but apparent size changes due to changes in camera baseline are
>independent of apparent size changes due to changes in perspective
>(changes in distance of viewpoint from image), though these changes
>multiply.
>
>Changing baseline changes all three dimensions.
>
>Changing perspective only changes the third or depth dimension.
>

Tsk, tsk, John; this is geometry, _not_ perception!  Not that
the two aren't related, but it ain't nohow the whole story!  :-)

When I look at prints taken with a 3DMagic with its _really_
itty bitty baseline (with the whole print enlarged to about 3"
in height), shapes of objects look flattened, not stretched,
even when there is a detectable disparity gradient.

-Jim C.


------------------------------------------------
Jim Crowell
U.C. Berkeley School of Optometry
360 Minor Hall, Berkeley, CA 94720
(510) 642-7679
jim@xxxxxxxxxxxxxxxxx



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