Black-and-White Infrared Film for Color Photography
Final rept. 1 Nov 1969-31 Mar 1971
TECHNICAL OPERATIONS INC BURLINGTON MA
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An attempt was made to use black-and-white infrared films as recording media for color scene information. The desired format for field use was a 5 inch tricolor striped film. Since current films are designed primarily as infrared receptors, their sensitivity balance was unsuitable for three color recording. In addition, their resolution proved too low for adequate modulation by a 40 lmm carrier. The latter limitation prevented experimentation toward a striped film because the present film striping system operates at 40 lmm. Investigations conducted with 30 lmm tricolor encoding gratings showed that the green, red, and infrared response of the films could be balanced in such a manner that all three spectral bands could be recorded at the exposure level. Outdoor exposures indicated that the balancing filters reduced the speed of the film to an effective ASA of about 60. Because of the low resolution capability and high granularity of the infrared films, their latitude for recording 30 lmm modulated imagery was poor. When color imagery was retrieved from positive transparencies prepared by duplication from the original modulated negatives, it proved to be of low saturation and exhibited a high level of grain noise.