P3D Re: Photographing Anaglyphs

[roberts@xxxxxxxxxxxxxxxxx (John W Roberts)]

>Date: Thu, 29 Jan 1998 17:42:13 -0700
>From: "H a r o l d   B a i z e" <baize@xxxxxxxxxxxxx>
>Subject: P3D Photographing Anaglyphs

>Michael wrote:
>>>I was just looking at my anaglyph poster of the Grand Canyon and got to
>>>wondering...if I placed my red/blue glasses over the lenses of my stereo
>>>camera...and then shot a photograph...would it come out as 3d in my
>>>slides?

>...If you photograph a gray scale analgyph through 
>red/blue glasses on a stereo camera you should end up with a stereo pair 
>with one chip in red/black and the other in blue/black (probably 
>with some ghosting). I did a similar thing a few years ago. I photographed 
>a George Coates production that involved live actors and a polarized 3-D
>projected virtual stage set. I just put polarized glasses in front of my 
>Kodak stereo and held the shutter open for about 3 seconds. It worked. 
>The polarized filters gave each lens what the human eye would see when 
>wearing the 3-D glasses. It should work the same with anaglyph, only the 
>resultant image would appear as a monochrome stereo image with a slight 
>purple tint to the white areas. 

Those who want to try this should be cautioned, however, that film doesn't
"see" colors quite the same way people do - in other words, a color 2D
photograph of a scene shot through a colored filter will not necessarily
appear to have the same colors as a regular photograph of the scene (shot
without the filter) which is *viewed* through the filter. For some scenes
this could potentially be a topic of concern, though I doubt that natural
scenes would be likely to cause complete failure of the anaglyphic stereo
effect. 

(How did the *actors* appear in the stage photographs?)

John R


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