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Abstract

Three-dimensional photographs produced with image bands of substantially equal density across the field of the lenticule are produced by increasing the intensity of exposure of the image bands near the edges of the lenticule in relation to the central image bands. This is accomplished by varying the duration of each exposure, or using a neutral density filter, a neutral density iris, a metallic iris with a multiple number of apertures, or by controlling the lamps in a multiple lamp housing. In addition, three-dimensional photographs are produced by a multiple number of successive exposures of short duration through the lenticules of the lenticular print film while the angle of projection of the enlarging lens is constantly changing. Exposure is made for a duration while the relative movement of the enlarging lens with respect to the lenticular print film is less than one-tenth of the aperture of the enlarging lens.

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First Claim