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P3D Re: Polarized Chalk, etc. Re: PHOTO-3D digest 2859
- From: Lawrence W Kaufman <kaufman3d@xxxxxxxxxxxxx>
- Subject: P3D Re: Polarized Chalk, etc. Re: PHOTO-3D digest 2859
- Date: Wed, 29 Jul 1998 21:46:20 -0700
Daniel Lyons wrote:
> As a graphics communications, printing and publishing Professor I,
> too, would like to know about this inexpensive wonder.
To the non-3D person chromatek glasses resemble polarizedglasses, because
they are not red/blue in color.
It was exploited first by Crayola with their Jumping Colors. There,
of course, is quite a bit of Chromatek on the 3D-CD (now available
in Eau De Sewage fragrance).
Almost a year ago, this phenomenon was discussed by Dale Walsh
and Larry Berlin....
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"Date: Fri, 22 Aug 1997
From: P3D Dale Walsh writes:
>A friend is looking for information on Chromo stereopsis. Is it
>the right term? If so, what does it mean exactly? Where does it
>come from? Who used it first? Etc.
Chromagraphics seems to hold a patent on the method. Visit their website
for more information.
http://www.earthchannel.com
I've usually heard the term ChromaDepth applied to this method.
Essentially the glasses use a prism to bend the different colors of light
at different angles. Since that also changes the direction of the light
path,
a second prism is added to correct the angle. In the process it doubles the
angle of separation for the colors. The special optical surface has been
created in a thin plastic lens using two types of plastic. The glasses I
have are for viewing computer monitors and have the special lens over the
left eye. The other eye looks through a perfectly clear non-distorting
lens. The result is that colors from the image appear to come from different
places due to the bending. Stereopsis is created by the colors themselves.
Since this is a lot like a diffraction grating, there is a small amount of
blurriness created as a result.
I have several images for that type of glasses on my web pages and a few
sample images that are for freeviewing that simulate the effect created by
the glasses. If you don't have the glasses yet, but want to see what they
do, visit http://www.sonic.net/~lberlin/new/chromad.html
Larry Berlin
Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/ "
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Lawrence
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