摘要 :
The frequency-contrast transfer functions were determined of layers of spectrozonal aerial films SN-6, SN-23, and Ektachrome Infrared Aerial Film. The determination method consisted in microphotometry of bands of erosion of the im...
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The frequency-contrast transfer functions were determined of layers of spectrozonal aerial films SN-6, SN-23, and Ektachrome Infrared Aerial Film. The determination method consisted in microphotometry of bands of erosion of the image of a knife-edge through narrow-zonal light filters and obtaining curves of D(X); the curves were recalculated according to data of corresponding sensitometric determinations into curves of E(X). Proceeding from the theory of the boundary function of a jump in brightness, the contrasts were calculated between light and dark shadings in the image of Pi-shaped periodic gratings of different frequency and determined the transfer function. The relative error of determination was about 5 percent.
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摘要 :
Black and white multispectral images have found use as inputs to various image analyzing instruments and for densitometrically determing spectral signatures. Due to redundancy of information, spectral bands sensed have been reduce...
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Black and white multispectral images have found use as inputs to various image analyzing instruments and for densitometrically determing spectral signatures. Due to redundancy of information, spectral bands sensed have been reduced in number to essentially the three layer sensitivities of color infrared film. Since a rather meager bank of true multispectral photography exists, it was deemed cogent to investigate the practicality of deriving black and white multispectral images from multilayer color infrared film. The technique of separation involves confining light by means of a separation filter to a very narrow spectral band which matches the maximum density wavelengths of a layer modulation being extracted and in which the dye densities of the unwanted layers are low. Errors inherent in the technique are of a low order of magnitude and result not only from interlayer interference during the separation process but from overlap of dye-forming layer sensitivities characteristic of color infrared film as well. When used as inputs to the IDECS image analyzing instrument, the black and white transparencies separated from a color infrared original performed as well or better than multispectral images originally exposed onto black and white film. (Author)
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The effort was directed toward the production of machine-coated film of free-radical photographic materials suitable for the reproduction of high-acuity continuoustone reconnaissance negatives through several generations. Satisfac...
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The effort was directed toward the production of machine-coated film of free-radical photographic materials suitable for the reproduction of high-acuity continuoustone reconnaissance negatives through several generations. Satisfactory machine-coatings, approximately 9-1/2 inches wide in 1000-foot lengths, were made of the DPA blueimage formulation and of the SQ/D-177 black-image photosystem. With these films, fourth-generation prints (with near-unity contrast and gamma) were achieved from aerial negatives of high, medium, or low contrast. Gammatonal response was controlled by variation of the spectral quality of the exposing light and exposure time. (Author)
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The sensitometric characteristics of Kodak color negative film Type 2445 with processing in a 1411 versamat with Kodak aero-neg. color process chemicals are described. These characteristics were determined for various combinations...
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The sensitometric characteristics of Kodak color negative film Type 2445 with processing in a 1411 versamat with Kodak aero-neg. color process chemicals are described. These characteristics were determined for various combinations of machine speed, prehardener temperature, and first developer temperature.
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This effort has demonstrated the feasibility of a technique (Concurrent Photon Amplification) to increase the rated speed of commercially available black and white film. The technique uses a supplemental non-imaging low light expo...
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This effort has demonstrated the feasibility of a technique (Concurrent Photon Amplification) to increase the rated speed of commercially available black and white film. The technique uses a supplemental non-imaging low light exposure concurrently with the image forming exposure. The technique has been installed in a Nikon F and Hasselblad 500 EL cameras. Tests with Kodak 2475, Tri-X, Pan, Panatomic-X and High Speed Infrared films have shown an increase in speed in every case, with the results being average speed increase of 2 to 4 times the rated film speed. In addition to the speed gain, there was an increase in the dynamic range and no loss in image quality of the film. A technique for use with processed films that provide a speed increase by physical development was also investigated. The technique was tested with the type films listed above and provided a speed increase of approximately 1/2 the rated film speed. (Author)
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摘要 :
To obtain a general view of the material's behavior, this study commences with descriptions of the film construction and the required recording stages. Subsequently, the descriptions are extended by considerations on some paramete...
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To obtain a general view of the material's behavior, this study commences with descriptions of the film construction and the required recording stages. Subsequently, the descriptions are extended by considerations on some parameters that influence the performance of the material. In a theory, formulated for a special type of deformation in thermoplastic films, is developed. To carry out the experiments with the available film the authors built a camera system for accomplishing the recording process and the related handling steps (such as the film transport). The principles, various units involved and some of the performences of this system are described. Some experiments which were performed with our film and the camera system are presented.
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The problems involved in making multicolor holograms are discussed, including spurious images and color rendition. Eight methods for constructing a multicolor hologram are presented with their advantages and shortcomings. The prob...
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The problems involved in making multicolor holograms are discussed, including spurious images and color rendition. Eight methods for constructing a multicolor hologram are presented with their advantages and shortcomings. The problems of experimental set up, film sensitivity, development, and relative luminous efficiency of the eye are mentioned. Color photographs of the best results are shown. The large object to reference beam angle method is recommended for first attempts at making a color hologram. The general formula for the reconstruction angle from a color hologram is derived. (Author)
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The modulation transfer function of a photographic film with antihalation treatment can be calculated as a frequency spectrum if the Frieser constant is known. It is suggested that the latter be determined by the maximum gradient ...
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The modulation transfer function of a photographic film with antihalation treatment can be calculated as a frequency spectrum if the Frieser constant is known. It is suggested that the latter be determined by the maximum gradient of the function of the distribution of illumination across a knife-edge. It is shown that in order to obtain unambiguous parameters this function must be normalized. This approach has been tested experimentally. (Author)
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This report covers the development of a viscous ink, two line film titler incorporating a motor driven film transport, an illuminated viewing stage and a single titling unit for use with 70MM, 5 inch and 9 1/2 inch wide roll film. (Author)
