Method of processing a color image to obtain color and black reproduction signals
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United States of America Patent
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Dec 15, 1992
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N/A
app pub date -
Aug 30, 1991
filing date -
Dec 29, 1987
priority date (Note) -
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Abstract
According to a method and apparatus for processing a color image, three primary color signals are input, and the input three primary color signals are processed to obtain three color reproduction signals and a black reproduction signal. In order to obtain the black reproduction signal, a value corresponding to a minimum value of the three primary color signals is obtained, and the value is transformed by a continuous function having a downwardly convex shape, thereby defining a transformed value as the black reproduction signal.
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