Color was used in film well before The Wizard of Oz . Thomas Edison, for example, projected two-colored films at his first public screening in New York City on April 23, 1896. These first colors of early cinema were not photographic; they were applied manually through a variety of laborious processes--most commonly by the hand-coloring and stenciling of prints frame by frame, and the tinting and toning of films in vats of chemical dyes. The results...