P3D Re: Photographing Anaglyphs

[r3dzone@xxxxxxxxxxxxx (Ray Zone)]

Ray Zone responds:

An anaglyph is a complementary color multiplex of a left eye and right eye
image  superimposed into a composite. The trick is to "demultiplex" or
cleanly extract the left and right eye views from the composite so that
'ghosting' or crosstalk is non-existent or minimal and a decent stereo pair
is produced.  Kodak recommends Wratten gelatin filter No. 65A for Red and
No. 92 for Cyan.  Of course you can use a stereo camera for the photography
but any single lens camera with close-up lenses or diopters will also
suffice for the photography (one advances the film after making separate
'filtered' exposures).  The ideal film to use would be Pan-X, Panchromatic
film, i.e. a B&W film that "sees" color as opposed to any orthochromatic
B&W film which does not. Ortho film would see the red filter as Black.
Color film can be used but exposure tests are recommended because of
varying transmission characteristics that will result, and there are
differences between negative and positive slide film that will become
apparent.

Historic notes: For many years color separations for printing and motion
pictures were produced by the use of filters and B&W panchromatic negative
film.
Kinemacolor motion picture cameras and projectors became popular in the
early 1900's and they used a rotating filter wheel with Red-Green-Blue and
single-strip pan B&W film.  The process produced (imperfect) color motion
pictures.  Both 2-strip and 3-strip Technicolor used filters and pan B&W
film with 2 or 3 separate strips of 35mm film loaded in the camera.  The
separate B&W color records were then composited onto a single film strip by
various methods, usually a dye imbibition process.

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