Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1993-09-08
1994-11-15
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358509, 358506, G03F 308
Patent
active
053653530
ABSTRACT:
The present invention relates to a process for making copies of photographic originals in a photographic copying machine, comprising the steps of sectionally scanning the original being copied by a measurement system in a measurement station of the photographic color copying machine, feeding measured light that is transmitted or remitted from each scanned section of the original being copied to a detector configuration, converting the measured light into electrical signals as a function of wavelength and intensity of the measured light, digitizing the electrical signals to obtain color data for processing in a computation and evaluation unit, and analyzing the color data in an analysis unit to establish correction values. The step of analyzing further includes steps of (a) subjecting the color data to a reversible linear or non-linear standardization transformation that is order or film type specific, (b) converting the color data into normalized color values to provide initial data for the analysis unit, (c) forming film specific normalized correction values in the analysis unit from the normalized color values, taking into account color, density, and structural characteristics of the original being copied, and (d) converting the film specific normalized correction values of the analysis unit into de-standardized correction values in a de-standardization unit that is attached to the analysis unit using a de-standardization transformation which is inverse to the standardization transformation, the de-standardized correction values also taking into account the color characteristics of the film material being copied. A required amount of copying light is determined from the de-standardized correction values in an exposure calculation unit, and copies are made from the original being copied in an exposure station based on said copying light.
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European Search Report, EP 92 81 0698, dated May 11, 1993.
I. N. Bronstein, K. A. Semendjajew, "Taschenbuch der Mathematik", 19th Edition, Harri Deutsch Publishers, Thun, 1980, pp. 772-781.
Hunt, R. W. G., "Colour reproduction by photography", Rep. Prog. Phys. 1977 40 pp. 1071-1121.
Coles Sr. Edward L.
Gretag Imaging AG
Lee Fan
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