Re: Anaglyph Projection

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 19:03 9/22/96, P3D  Hayden B. Baldwin wrote:
>While I just know this subject has been discussed by all you "experts"
>out there, please humor me. I'm looking for information on the projection
>of anaglyph slides. Seems as though it would require less equipment
>(standard slide projector, standard screen), slides would be probably as
>bright as normal 2D slides, no loss of light because of filters or
>polarized glasses.....where's the catch? Seems too simple, there has to
>be catch. Please oh great wise ones, enlighten me.
>

Hi Hayden,

Besides all the considerations that everyone else has brought up, you also
have the problem of getting viewing glasses that maintain good color
separation.  This is particularly a problem with slides that were output by
a computer, because the green phosphor in particular tends to be very
broad-band & tends to spill over into the band of wavelengths passed by the
red filter, particularly if the filter has any orangey tint to it (as the
red filters on the cheap cardboard anaglyph glasses tend to).

The best way to guarantee good results inexpensively is to go to a
theatrical supply store & buy some of the gel filter material that they use
on colored spotlights.  If you take a slide along & leaf through the filter
samples you can usually find a pretty good pair of colors.  The catch is
that you've either got to make the glasses yourself or pass the filters
around separately...

-Jim C.

----------------------
Jim Crowell
Division of Biology
216-76
Caltech
Pasadena, CA
(818) 395-8337
jim@xxxxxxxxxxxxxxx



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