Color conversion method and apparatus with a variable gray compo

Details Color conversion method and apparatus with a variable gray compo Color conversion method and apparatus with a variable gray compo

1993-08-19

1995-03-28

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, H04N 146, G03F 310

Patent

active

054022533

ABSTRACT:
An amount of a black colorant is determined from input color image signals. Then, chromaticity values, for instance, on the L*H*C* color space, of a color that is obtained by subtracting the above black amount from the input color image signals and represented by C, M and Y are determined. Finally, colorant amounts of C, M and Y are determined from the chromaticity values thus determined.

REFERENCES:
patent: 5231504 (1993-07-01), Magee
"Considerations (I) on Black Addition in Printing", Sayanagi and Tamune, Proceedings of First Color Engineering Conference, 1-7, pp. 33-36 (1984).
"The Theory and Practice of Black Printer", Nakamura et al., Electrophotography The Society Journal 29(3):67-75 (1990).
"Color Masking (I)", J. Tajima, The Journal of the Institute of Image Electronics Engineers of Japan, 18(1):20-28 (1989).
"Color Masking (II)", J. Tajima, The Journal of the Institute of Image Electronics Engineers of Japan, 18(2):44-48 (1989).

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