Apparatus for controlling the color balance of a photographic im

Details Apparatus for controlling the color balance of a photographic im Apparatus for controlling the color balance of a photographic im

1988-12-05

1990-04-17

Adams, Russell E.

354430, 354482, G03B 2100

Patent

active

049184709

ABSTRACT:
A selected one of two or more variable density color filters is automatically positioned in the optical axis of a taking lens of a photographic camera, if necessary, prior to an exposure in order to automatically effect a color balanced exposure of a photosensitive material located within the camera. The color balance of a photographic image formed in a photosensitive material is dependent upon several factors. These factors include the color balance of the photosensitive material, the color temperature of scene illumination and the temperature of the photosensitive material processing fluid. In the present arrangement, the position of the variable density filter in the optical path of the taking lens is concurrently dependent upon one or more of these factors which, under certain conditions, may collectively offset one another such that movement of a variable density color filter for photographic image color balancing purposes does not occur.

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patent: 4329411 (1982-05-01), Land
patent: 4736215 (1988-04-01), Hudspeth et al.

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