Method for under-color removal in color image forming apparatus

Details Method for under-color removal in color image forming apparatus Method for under-color removal in color image forming apparatus

1992-04-16

1994-10-25

Ro, Bentsu

Facsimile and static presentation processing

Natural color facsimile

Black signal synthesis

358530, 358429, 358455, H04N 146, G03F 300

Patent

active

053594371

ABSTRACT:
A method for under-color removal in a color image forming apparatus comprises color conversion means for converting separated color signals into first color output signals, first black generation means for calculating first black output signal based on the maximum and minimum values of the first color output signals obtained by the color conversion means, means for performing under-color removal to calculate second color output signals by correcting the first color output signals converted by the color conversion means based on the first black output signal generated by the first black generation means and then removing under-color values from the first color output signals, black amount correction means for calculating second black output signal by correcting the first black output signal obtained by the first black production means, and chroma correction means for correcting the second color output signals obtained by the means for performing under-color removal based on the second black output signal obtained by the black amount correction means.

REFERENCES:
patent: 3615441 (1971-10-01), Deneau
patent: 4930007 (1990-05-01), Sugiura
patent: 5126838 (1992-06-01), Ohsawa et al.
patent: 5132788 (1992-07-01), Hirota
patent: 5237400 (1993-08-01), Washio et al.

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