Image Enhancement by Chemical Intensification.
Technical rept. Mar-Dec 74,
ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
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This report covers the use and evaluation of a quinone-thiosulfate chemical intensifier to improve image characteristics in photographic negatives of low density and contrast. The report concludes that 1 Apparent emulsion speeds of aerial films can be increased by a factor of as high as two with quinone-thiosulfate intensification as a post-processing treatment. 2 Quinone-thiosulfate intensification may improve the resolution of low density negative imagery, but not that of normal negatives. 3 as both a contrast and emulsion speed enhancing process, quinone-thiosulfate may greatly improve the usefulness of imagery to be used with image data-extraction devices. 4 The opportunity is presented, through intensification to save unique images with inadequate contrast and density, and to tailor densities and contrasts to fill a variety of human and machine needs. 5 Further, more definitive work is required to define the exact methods and criteria for applying this intensification method to actual problems requiring improved contrast andor resolution. Author
- Cartography and Aerial Photography