Technicolor

Trade name for a film colour process using three separate negatives of blue, green, and red images. It was invented by Daniel F Comstock and Herbert T Kalmus in the USA in 1922, and became the most commonly used colour process for cinematography.

Originally, Technicolor was a two-colour process in which superimposed red and green images were projected on the screen by a special projector. This initial version proved expensive and imperfect, but when the three-colour process was introduced in 1932, the system was widely adopted, culminating in its use in The Wizard of Oz and Gone With the Wind, both 1939.