Color Reversal Film

Figure 4-14.—Aerial photograph taken with black-and-white film without a filter. increased inherent contrast and color saturation of the film. When a high degree of magnification is required, Kodak Ektar film can provide excellent results. Color negative film has much better exposure latitude and is more versatile than color reversal film. Color negative film is often an excellent choice for aerial photography, particularly when you are unaware of some possible uses for the photography, or there is more than one type of finished product. Black-and-white printing paper, designed to be processed through color-chemical processes, can provide excellent results, and color slides may be made easily by copying color prints. Color Reversal Film When only color slides are required, you should choose a color reversal film, such as one of the Kodak Ektachrome films. This type of film comes in a number of ISO speeds and is excellent for making aerial slides. High-speed color reversal film is useful for photography in the late afternoon or at dusk when the light level is low. When you must take color pictures in a heavy haze or from high altitudes, contrast can be improved somewhat by having internegatives made from color slides. Color prints can also be made directly from color slides. Infrared Color Film Infrared color aerial photography is useful for obtaining photographic information that is not available through conventional photography. Ordinary color film has three emulsion layers that are sensitive to blue, green, and red light; IR color film is sensitive to blue, green, red, and infrared radiation. The result is transparencies that reproduce original scene colors differently for most natural features. IR radiation appears as red, green reproduces as blue, red reproduces 4-15