P3D Re: Instant Anaglyphs

[Ray Zone <r3dzone@xxxxxxxxxxxxx>]

This has been a very interesting thread.  Any experimentation with anaglyph
will eventually lead you right into the heart of color theory and the
properties of chromatic optics as well as the differences in subtractive
(pigment primary) and additive (light primary) color filtration.

Thank you William Carter for your excellent graphic illustrating full color
from two filters.

And Charlie Hotchkiss is correct about Edwin Land's experiments in color
perception.
On the cover of the May 1959 issue of Scientific American is displayed a
full color photograph and the subtitle "Full Color from Red and White."
Land's article titled "Experiments in Color Vision" illustrated the
production of this photograph.   Land writes that, "one image is
photographed through a green filter and the other through a red filter.
The images are photographed on ordinary (panchromatic) black-and-white
film; then black and white positive transparencies are made from the
negatives...the 'red' transparency is projected through a red filter and
the 'green' without a filter.  When the two images are superimposed on the
screen at right, they reproduce the objects in a full range of color."

The conclusion is that "The eye has recently been found to be an instrument
of wonderful and unsuspected versatility.  It can perceive full color in
images which, according to classical theories, should be monochromatic."

In remarking on the color deficiencies of the 2-strip Technicolor system,
William Carter is correct in stating that it was a result of the
limitations of the dye imbibition process itself.  I have seen footage of
the Kinemacolor motion picture process from the 1920's (very similar to
Land's experiment) that used rapidly alternating red and green filters over
the projector and (since it was working with light primaries rather than
pigment) produced a fuller range of color than the 2-strip Technicolor
system.

So, Tom Deering, it looks like you have to pay up.  How about donating the
$100 to the National Stereoscopic Association?  If you like I will email
you a scan of Land's full color image made from the two filters.

Just as a footnote, the issue of American Cinematographer with the full
color anaglyphs and articles on the VIDEOWest system is from April 1974.
It features a polychromatic anaglyph photograph on the front cover of Liv
Ullman.

Best!

Ray '3-D' Zone



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