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Exposure Control in Television Film Recording

1960; Society of Motion Picture and Television Engineers; Volume: 69; Issue: 9 Linguagem: Inglês

10.5594/j09419

0361-4573

Rodger J. Ross,

Industrial Vision Systems and Defect Detection

Attempts to “improve” the picture quality of film recordings by adjustments of recorder setup or modifications of the film process have produced, in general, disappointing results. The advantages of a constant density and density difference film process are outlined. Sensitometric analysis of film response characteristics and exposure conditions may be employed for accurate control of image formation. A linear overall transfer characteristic may be achieved by selecting the most favorable operating conditions in reference to a standardized telecine reproducing condition. To maintain these conditions, a sensitive and accurate photometer is required, together with a standard reference staircase signal. The paper describes the design and use of a photometer utilizing a modified Densichron amplifier and probe, and a calibrating light source.