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Anaglyph Glasses |
The classic "anaglyph", or
"filtered-viewing" method
requires the viewer to wear red and blue (or cyan) "ANAGLYPH
GLASSES".
Red light enters the left eye only (in principle), while blue light
enters the right eye. Anaglyphs are made by combining color
channels from the left and right images of a stereo pair into a
single color picture. For example, a monochrome composite can
be constructed by taking a B&W left image and overwriting it into the red
channel of the right image's B&W frame. The resulting
right frame is then called a
"Gray Anaglyph". There are many color combination,
but the most common is Red left, Cyan Right.
Surprisingly, in spite of the color-filtering
properties of the anaglyph glasses, pretty decent pseudo-color
stereos can be constructed by mixing the left and right color
channels to produce a color composite called a "Color Anaglyph."
Some scenes work better than others. For example, a picture
dominated by stark reds or deep blues is difficult to convert into a
good color red-cyan anaglyph. There is often a trade off between color
accuracy and comfortable 3D viewing with minimum leakage of
left picture information into the right eye (and vice versa),
which is called RIVALRY. A good color anaglyph
should not suffer such red-cyan ghosts. It will also have reasonably decent color.
Greenish scenes are typically the best to make into good color
red-cyan anaglyphs.
The anaglyphs on
this site are computer generated by the flash player, using
various anaglyph (i.e. channel mixing) algorithms.
Human-intervention could probably improve some (perhaps many) of
such anaglyphs by adjusting the mixing parameters and the stereo
window.
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Color Anaglyph of Avalanche Creek |
Gray Anaglyph of Avalanche Creek |
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