Movie Makers (Jun-Dec 1928)

Scientists Hail Color Film I o Amateur Use Eastman Shows Notables I Action Scenes in Natural Tint Developed Through Filter in Camera Lenses that you will like to learn somewhat more fully how the result is achieved. The color filter is composed of three separate areas — red, green, and blue — and it slips into the lens in the place of an ordinary hood, which is removable. But the secret of the Kodacolor process is in the film. The film surface is embossed by running it through steel rollers with tiny cylindrical lenses composed of the film base material and extending lengthwise of the film. The lenses on the film are about seven times narrower than the dots making up the illustrations in a newspaper, and they are therefore invisible except under a microscope. They cover completely the surface of the side of the film opposite from the sensitive emulsion. That surface faces the camera lens, and the emulsion is away from the lens. "When the trigger of the camera is pressed, light reflected from the subject passes selectively through the three-color filter, on through the camera lens, and thence through the tiny embossed lenses on the film to the sensitive emulsion coating on the opposite side, where it is recorded. The function of the lenses embossed on the film is to guide the rays of light falling upon each tiny area and lay them on the sensitive emulsion as three distinct impressions corresponding to the three filter areas so that the three colors covering the lens are imaged behind each tiny cylindrical lens as three parallel ver Geuerations' Labor Ends With Triumph Process Leaves Way Open for Radio Development With Picture Projected^ By Richard Watts jr ESTER. N. V-, Jul* 30.— TJ of motion pictures in ccj hrust into the backgroj ush ot the talking rst importance agal distinguished p: ther public ngUj rge Eastm h full natu, Id he tical strips, drical lenses stripes of color on the the width of each of because the tiny are parallel cylinto the filter. Thus the minute areas of emulsion is subdivided into three parts related to the three filter areas and affected by light that is able to pass through the different colors. The sum of these invisibly small affected areas of film constitutes the whole photographic image. "A red ray from an object in front of the camera, for instance, reaches the sensitive material of the film at a spot related to the red area of the filter. The 'reversal process' turns this affected spot into a transparent area, leaving opaque the adjoining unaffected areas related to the green and blue segments of the filter. "So, also, with the green and blue and with combinations of colors. The sum of the points on the scene containing red makes a photograph from red light on the emulsion areas related to. the red filter area, the sum of the blue also makes a separate photograph, and similarly with the green. "Now, in order to project the pictures, the developed film is put in the projector, which contains exactly the same optical system reversed. Behind the film is the condenser and the source of light. The color filter consists of the same three primary colors — red, green, and blue. The reverse of the fact that white light divides up into the colors of the spectrum is that light coming evenly out from the three colors of the filter on a projector and superimposed on a screen appears white. "But cover up the green and blue segments of the filter and the screen will turn red. Cover up the red and blue and the result will be green. "With the red and green areas both left for the light to shine through, we get yellow. White minus red gives blue-green. White minus green gives magenta. Varying the areas of each color through which the light may shine will give infinite shadings between these colors. Black is the total elimination of light. "Now, when we have a picture on the film, the opaque areas of the film cover up, in effect, certain of the filter areas; they prevent the light from going through where it is not needed, by cutting off, at the film, rays which would otherwise pass out through the embossed lenses, through the projection lens, and through the filter area in question to the screen. "For any point on the scene, the 571