Kinemacolor

Kinemacolor was an early natural color motion picture process. Patented in 1906 by George Albert Smith, it was first publicly demonstrated in 1908. The process worked by alternating the projection of black and white film frames, each exposed through a different colored filter, either red or green. A special projector with a rotating color wheel was used to project the film, flashing red light through frames exposed with a red filter and green light through frames exposed with a green filter. This rapid alternation of red and green light was intended to trick the viewer's eye into perceiving a full spectrum of color due to the persistence of vision.

The Kinemacolor system was not a true additive or subtractive color process in the modern sense, but rather a form of "two-strip" color. It relied on the fact that the human eye can blend red and green light to perceive a range of colors, though the resulting images often had a distinct reddish-greenish hue. Despite its limitations, Kinemacolor was a significant innovation for its time and was the first commercially successful color film process. It was used to film documentaries, travelogues, and some narrative films. Production of Kinemacolor films began in 1908 and continued until around 1914. The process eventually fell out of favor due to technical limitations and the development of more sophisticated color film technologies.