I bought some cheap red-cyan glasses from www.reel3d.com and find that
they are in some ways significantly better than the more common red-blue
glasses for cheap stereo. With red-blue, the complete lack of green to
which the eye is particularly sensitive makes the overall scene quite
dark, and overlap regions are magenta, which isn't very attractive. With
red-cyan, the scene is much brighter, and overlap regions are gray,
which looks nicer. It is true that "ghosts" are somewhat more of a
problem with red-cyan, but surprisingly not as much as one might expect.
It seems possible that one might even achieve something like full color.
In the overlap regions, which are gray with the current implementation
of scene.stereo = 'redcyan', in principle one could display all colors,
with only the nonoverlap areas being limited to red and cyan. Even if
there is no overlap, you could still perceive full color if the red
channel plus the cyan channel preserved the full color information.
However, that would mean that a pure red object would display to only
the left eye (and an object that has no red content would display only
to the right eye). Perhaps one could unsaturate the colors somewhat
(that is, add some white) to ensure that all objects had some red and
cyan? Maybe this is worth tinkering with.
Bruce Sherwood
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