Five Color Separation Investigation
Technical Report,01 Dec 1966,01 Sep 1967
TE CO SANTA BARBARA CA SANTA BARBARA United States
Pagination or Media Count:
The purpose of the program was to determine the feasibility of extracting wanted single colors from multicolor maps. Unlike conventional three color graphic arts methods of color extraction, the approach utilized from four to twenty color sample analysis and analog and digital processing of the color data. The object map was line scanned, the resultant optical signal separated into color channels that in turn were converted to electronic signals and these signals processed to produce a yes-no output recreating the wanted color line scanned on film. Both color matrix optimization and multilevel logic electronic processing functions were evaluated. The results showed that color matrix optimization was not completely effective. The multilevel logic function, however, produced excellent results for several sample map sections tested. These maps included variations in print color, color overprinting, variations in substrate paper, and a wide variety of print geometries. The overlay of the resultant color extractions produced a faithful rendition of the original map, with the slight exception that fine detail such as halftone printing tended to be enhanced. Setup time to establish the logic extraction parameters for a given map was about 15 minutes for each color.