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Optimizing Photographic Information Transfer By CRT - A Technology And Applications Review

This paper reviews the development of technology for optimizing the reproduction of aerial, medical and other photography by scanning-type photo printing systems, utilizing a cathode ray tube as light source. The basic method of controlling exposure level and detail contrast in a reproduction, by means of an unsharp luminous mask generated by a scanning printing light source, was devised several decades ago and has reached a high state of development. Central to the luminous mask concept is the principle that the image itself is not dissected and reconstructed as in a video imaging system. It is embodied in a variety of photographic devices: contact printers, strip printers, enlargers and reducers, for both black and white and color reproduction. Recent developments have resulted in more efficient operation of the cathode ray tube light source and made possible the exposure of relatively insensitive reproduction materials such as dry silver and duplicating films at rates which are significantly faster than previously possible. Automatic evaluation of exposure and contrast control requirements has been implemented in medical x-ray microfilming applications and is under development in aerial and industrial radiography systems.