P3D Re: random dot eidetikers

[wier@xxxxxxxxxxxxxxxxx (Bob Wier)]

>I'm not clear on what you mean by  "Land pictures", but I'm equally hard

Here's what the article says...

"Edwin Land, originator of the Polaroid camera, discovered that black and
white film could produce full-color pictures. Two pictures of the same
scene are taken on black and white film, one through a red filter and
the other through a green filter. The picture taken through the red
filter is then projected onto a screnn through a red filter and the 
picture taken with a green filter is projected through a green
filter or *without a filter (that is, white light)* (emphasis mine). 
When the two images are superimposed, the projected picture has all of
the colors of the original scene - blues and yellows as well as
reds and greens. Full color can be produced with various filter
combinations - for example, green and orange or red and blue-green."

Note the red/cyan suggestion - kinda sounds familiar, no?

I'm probably mis-remembering this, but it seems to me that this
is/was important in the Polaroid process because it meant that only
two filter layers were required in the film rather than the more
obvious RGB or CMYK.

   ====== wier@xxxxxxxxxxxxxxxxx ======
  12:46 PM Friday, December 26, 1997
   keeper of the Photo-3d and Overland-Trails
       mailing lists and other stuff
     (currently in Ouray, Colorado)





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