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That is quite correct Bojan. It works because the two b&w slides are modulating the relative luminances of the full spectrum of the projector globe. The red filter or any other then further modulates the relative spectral luminances of each part of the image.
I first saw this effect demonstrated in 1969 at Kodak Research Laboratories. You have to know a lot about the human visual system and different lighting conditions to make colour film.
Remember Daylight and Tungsten type film? Or filters that could get a white colour balance under either. Those were the days!
Bert
Last edited by avandonk; 30-03-2010 at 10:26 AM.
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