Perha Technicolor Research Paper

After experimenting from 1915 to 1921 with additive color systems that filmed and projected the two color components simultaneously, rather than in rapid alternation (thereby eliminating Kinemacolor's color flicker and false color fringes around rapidly moving objects), Dr. Herbert Kalmus, Dr. Daniel Comstock, and mechanic W. Burton Wescott (who left the company in 1921) developed a subtractive color print process for Technicolor. As in their final additive system, the camera had only one lens but used a beam splitter that allowed red and green-filtered images to be photographed simultaneously on adjacent frames of a single strip of black-and-white 35 mm film, which ran through the camera at twice the normal rate. By skip-frame printing from the negative, two prints were made, on film stock with half the normal base thickness. They were chemically toned (i.e., the silver particles forming the black-and-white images were proportionally replaced by coloring matter) to colors roughly complementaryto the filter colors (red for the green-filtered images and vice versa), as subtractive color reproduction requires.[44] They were then cemented together, base to base, into a single strip of film. No special projection equipment was needed. The first publicly shown film using this process was Toll of the Sea (1922) starring Anna May Wong.
By 1932, general color photography had nearly been abandoned by major studios, until Technicolor developed a new advancement to record all three primary colors. Utilizing a specialdichroic beam splitter equipped with two 45-degree prisms in the form of a cube, light from the lens was deflected by the prisms and split into two paths to expose each one of three black-and-white negatives (one each to record the densities for red, green, and