P3D Re: Anaglyph filter material

[Tom Deering <tmd@xxxxxxxxxxx>]

>Jim Crowell <crowell@xxxxxxxxxxxxxxx> wrote:
>>> 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!
>
>Thanks a lot for the advice Jim, but I tried that out, and the spotlight
>filters I could get hold of were not plane-parallele, and that made them
>useless. You seem to get a better quality in The States ;-) Hollywood
>pressure I presume ?

No.  When gels (filters) are new they are as flat as paper.  After they
have been in front of a 400 degree heat source for a while, they get
wrinkled.  You need to buy them new.

Tom



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