Digital color image processing method and apparatus employing th

Details Digital color image processing method and apparatus employing th Digital color image processing method and apparatus employing th

1985-05-06

1988-03-01

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 355 38, G03F 308, H04N 146, G03B 2780

Patent

active

047290161

ABSTRACT:
A digital color image processing method and apparatus is characterized by producing three color reproduction functions by normalizing samples of color values from three color components of a digital image. The color reproduction functions are applied to the respective color components of the image to produce dimensionless Z values. A contrast adjusting constant is computed and the dimensionless Z values are multiplied by the constant to adjust the contrast of the processed image. Finally a constant representing the mean density for each of the color components for a particular output medium is added to the contrast adjusted Z values to produce the processed digital image.

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patent: 4654722 (1987-03-01), Alkofer
patent: 4667228 (1987-05-01), Kawamura et al.
"Tone Correction of Color Picture by Histogram Modification, " Yoichi Miyake; Nippon Shashin Sakhaishi; V. 48(2), pp. 94-101, 1980, with English Translation.
"A Statistical Method for Image Classification and Tone Reproduction Determination," by R. Chung, Journal of Applied Photographic Engineering, vol. 3, No. 2, Spring, 1977.
"A New Approach to Programming in Photomechanical Reproduction," Yu. Ovchinnikov et al; W. Banks IPC Science and Technology Press, Guildford, England, 1974, pp. 160-163.

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