"gregjohn" <pte### [at] yahoocom> wrote:
> I was playing around with some red-cyan anaglyphs and my son pointed out that
> the "red" portion of the screen wasn't perfectly blocked by the "red" lens.  Is
> there a technological limitation here (see thread about "yellow" lens), or is
> there just a more perfect rgb value I might be able to find?

I remember old 3-D comic books and such having the same problem. I think the
main limitation is the rather broad-spectrum 'red' color that is used in those
inexpensive cellophane glasses. They let pass too many light frequencies
'around' the red (or block too few??) I suppose an *ideal* red filter would need
to be almost monochromatic--and matched exactly to the printed color of the
anaglyph (or the projected color of a film/transparency.)

Ken

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