P3D Re: anaglyph filter material (was Re: P3D JPG destruction)

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 2:31 AM -0700 4/28/98, Ole Hansen wrote:
>>> I (Stereoskopklubben) are still looking for red/cyan glasses
>>> with proper filters. Anybody having advice on this ?
>> The very bad news is: John Bercovitz, and some others on this list,
>> ran some tests which showed that certain screen phosphors (as I
>> recall, green) were illuminated by a non corresponding signal
>> (I think it was red). You may not be able to get a good anaglyphic
>> reproduction off a monitor ?!?
>
>With a modern monitor, there are no problems getting a decent
>(if not good) representation of black/white and color anaglyphs.
>The monitorcolors are standardized, and balance, gamma, and
>intensity can be adjusted. If not from the outside then inside the box.
>The problem is the red and cyan filters. They must be matched very
>accurately to reduce colordistortion in coloranaglyphs and to give
>pure grays in black/white anaglyphs.

The best source I've found are theatrical supply shops.  Good ones sell a
very broad selection of color filter materials for spotlights.  The store
that I bought from back in Berkeley had a little booklet with small samples
& graphs with the spectral transmittance of each material!

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
Mail Code 216-76
1200 E. California Blvd.
Pasadena, CA 91125
Tel: (626) 395-8337
Fax: (626) 795-2397
jim@xxxxxxxxxxxxxxx
http://vis.caltech.edu/~jim/Home.html




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