Method for under-color removal in color image forming apparatus
First Claim
1. A device for under-color removal in a color image forming apparatus comprising:
- 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 said color conversion means;
means for performing under-color removal to calculate second color output signals by correcting said first color output signals converted by said color conversion means based on said first black output signal generated by said first black generation means and then removing under-color values from said first color output signals;
black amount correction means for calculating second black output signal by correcting said first black output signal obtained by said first black generation means; and
chroma correction means for correcting said second color output signals obtained by said means for performing under-color removal based on said second black output signal obtained by said black amount correction means.
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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.
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Citations
7 Claims
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1. A device for under-color removal in a color image forming apparatus comprising:
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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 said color conversion means; means for performing under-color removal to calculate second color output signals by correcting said first color output signals converted by said color conversion means based on said first black output signal generated by said first black generation means and then removing under-color values from said first color output signals; black amount correction means for calculating second black output signal by correcting said first black output signal obtained by said first black generation means; and chroma correction means for correcting said second color output signals obtained by said means for performing under-color removal based on said second black output signal obtained by said black amount correction means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification