Films, ContinuedColor filmColor film also consists of a light-sensitive emulsion on a transparent oropaque base used to record images. The main difference between color andblack-and-white films is that color emulsion consists of three distinct layers.Each of the three layers of emulsion records one of the three additiveprimaries - red, green, or blue. Modern films have fast and slow emulsionlayers for each primary color to improve film speed and resolution. Colorfilms produce reversals (positive) or negative images.COLOR REVERSALS: Color reversal films produce positive images indensities directly proportional to the objects in a scene. Reversal filmscontain the suffix “chrome” in their name. Development of color reversalfilms is a two-stage process. Developed color reversal film can be used astransparencies (slides) for direct viewing, printed directly onto color reversalpaper, copied on black-and-white films for producing black-and-white prints,or copied onto color internegative (copy negative) for producing color prints.COLOR NEGATIVES: Color negatives record scenes in image densitiesopposite to the brightness of objects in a scene. Most color negatives have anorange mask that increases color separations producing colors moreaccurately. Color negative films contain the suffix “color” in their name.Color negative images can be printed on color positive materials such ascolor-paper and color-print film to produce color prints or transparencies.Color negatives can also be printed on special panchromatic black-and-whitepaper to produce black-and-white prints.Film formatThe two basic film formats commonly used in the Navy are roll film andsheet film. Both formats come in a variety of sizes. Both film formats areavailable in black-and-white or color.Roll filmRoll film is film packaged so that it may be loaded and unloaded from acamera in daylight. Number 120 roll film has a paper backing that preventsinadvertent exposure; 35mm film is wound in light-tight cassettes. The mostcommon film size, 35mm, comes in prepackaged cassettes in lengthsproducing 12, 20, 24, and 36 exposures or frames per roll. Also, 35mm filmcomes in 100-foot rolls for bulk loading into reusable cassettes.Continued on next page7-35
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