We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
of the recorder accomplishes the same purpose without requiring alteration of the lamp current.
When exposed on typical sensitometers available in commercial motion picture laboratories, Ultra-Speed panchromatic film records density on all the steps because, when these instruments were designed, films having the sensitivity of Ultra-Speed panchromatic film possibly were not contemplated; whence the sensitometers have been calibrated to suit the speed characteristics of the supersensitive panchromatic emulsions. In order to study the threshold or shadow density characteristics of the Ultra-Speed film, the addition of a 25 per cent neutral density filter has been found advisable, since it produces sensitometric strips having the required range of density without altering the characteristics of the I amp or disturbing the calibration of the sensitometer.
The speed advantage of two diaphragm stops, of Ultra-Speed panchromatic over Superpan negative film, is fairly constant under various daylight and artificial lighting conditions, indicating close similarity in the color-sensitivity characteristics of the two films. Wedge spectrograms, however, show that the UltraSpeed film has a slightly greater range of sensitivity to red light than the previous film and photographs of the coior chart show that Ultra-Speed panchromatic film has about 20 per cent greater response to red-colored objects than the old Superpan negative film. The photographic problem introduced by these colorsensitivity dissimilarities is not great and in most cases can be neglected with confidence. No special character make-up has been found necessary with the Ultra-Speed film even under 100 per cent tungsten illumination.
Problems of Printing and Development
In timing negatives made on Ultra-Speed and Superpan negative film, no allowances need be made for differences in the gray-base color, since they both have the same type of neutral gray antihalation layer on the base underneath the emulsion. When combined for printing with other negatives having lavender, pink, or orange-tinted gray bases of similar optical density, the Ultra-Speed panchromatic film may appear to be only three times instead of four times as fast, due to selective absorption of the printing light by the tinted gray bases. From three to five printer points may be required to compensate for the filter effect of tinted gray bases that depart markedly from a neutral gray.
When developed for a gamma 0.65 or lower, Ultra-Speed panchromatic film has a flatter gradation than Superpan negative film given the same treatment. When developed for a gamma of 0.7 or higher, the Ultra-Speed film becomes progressively steeper in gradation than Superpan negative film given the same treatment. Considering the contrast relationship of the two films in the range of negative gamma normally employed in professional motion picture work, together with the photographic characteristics of the subjects that usually will be photographed on Ultra-Speed panchromatic film, best screen results appear to follow the practice of developing Ultra-Speed panchromatic film about 20 per cent longer than Superpan negative film.
Page Eighteen