Re: Cardboard cutouts and backdrops...

[P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

>Date: Thu, 28 Aug 1997 20:29:32 -0500
>From: "P3D Gregory J. Wageman" <gjw@xxxxxxxxxx>
>Subject: Re:  Cardboard cutouts and backdrops...

>...
>John R. responded:

>>I enthusiastically agree - I think the ability to view and enjoy stereo
>>increases with practice. (That, and the ability to decouple visual cues
>>and concentrate on the ones the photographer is making use of.)

>John, could you elaborate?  I don't know what cues it is we're supposed
>to be decoupling.

The usual suspects - motion (as was just discussed), accommodation
(focus) coupled with convergence in a manner consistent with natural
vision, chromatic aberration as a depth cue, change in the view from
moving the head, etc.

Also convergence and interpretation of an absolute distance (or disparity
and interpretation of an absolute size?) - some people learn to decouple
these and can enjoy a hyperstereo of the Grand Canyon (for instance) as
a full size scene for which they are somehow magically able to see enhanced
depth. Other people have little or no success decoupling these cues, and
feel a strong (or even irresistible) inclination to interpret them as
miniatures.

There are other cues that hardly anybody learns to decouple - for instance
the difficulty in properly perceiving a pseudoscopic image of a human face.

Along with learning to decouple depth cues, it's important to learn to
recouple them when not viewing stereo photographs. :-)

John R


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