Color corrector in an apparatus for producing color image

Details Color corrector in an apparatus for producing color image Color corrector in an apparatus for producing color image

1993-06-07

1994-04-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358518, 348675, H04N 146

Patent

active

053030710

ABSTRACT:
A color corrector for correcting chromaticity of a color image to be reproduced is provided in a color printer or a CRT display device for reproducing a color image from respective signals corresponding to predetermined primary colors of a plurality of primary colors constituting the color image. This color corrector comprises: a corrective operation circuit for executing an operation between a color correction coefficient matrix and signals corresponding to the primary colors to correct relative levels of the signals corresponding to the primary colors; a gray component extraction circuit for making level comparison between the signals corresponding to the primary colors to thereby extract a gray component; a correction signal output circuit for executing an operation between the extracted gray component and correction coefficients determined by the matrix to output gray balance correction signals every primary colors; and an adding circuit for adding signals of which levels are corrected in correspondence with respective primary colors outputted from the corrective operation circuit to outputs from the correction signal output circuit.

REFERENCES:
patent: 4931864 (1990-06-01), Kawamura et al.
patent: 5126831 (1992-06-01), Nakagawara
patent: 5150206 (1992-09-01), Roberts
"A New Method for Calculating Color Reproducing Matrix Keeping the Grayness of Achromatic Colors", (1990) 7th Color Engineering Conference.

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