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Originally Posted by Steve McVoy
When I was in high school in the late 50s there was an article in Scientific American by Edwin Land, of Polaroid fame, about two color photograpy. I used my 35mm camera to photograph still objects on black and white film through first a cyan and then a magenta filter. I then used two slide projectors with filters to project the slides on a screen. The results were amazing, considering that there were only two colors used, but didn't come close to the quality of 35 mm color slides. Some colors (I can't remember which ones) were reproduced very poorly. I think Polaroid may have actually made 2 color film?
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AFAIK, Polaroid never produced a two-color film (at least not as a regular market product), but they did produce some of the very few 3-color
additive films ever made by anyone (Polavision 8mm instant movies and Polachrome 35mm instant slides). [Practically all other color photographic films ever made have been
subtractive in nature rather than additive.]
You're right that Edwin Land was very involved in color vision research. An interesting example/illustration of the *one* color version of the Land Effect (was) available at:
http://land.taylor.com/ but the site doesn't seem to be working now. A while back I saved one of the photos on that site though. I don't know if I should attach it or not, since it's not my image. Anyway, it's a picture of a cheeseburger created using only red and white (grey) pixels, but gives the illusion of a full color (but poorly saturated) photograph. Really weird!