Method and apparatus for freely selectable substitution of the a

Details Method and apparatus for freely selectable substitution of the a Method and apparatus for freely selectable substitution of the a

1994-04-07

1995-10-17

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, 358529, H04N 156, H04N 160

Patent

active

054595908

ABSTRACT:
A method for freely selectable substitution of the achromatic part in multi-color printing with the black ink on the basis of a spectrally photometrically scanned original, whereby supporting points in the color space are acquired in the spectrally photometric scanning of the original. Corresponding to a preselected degree, the achromatic part or the complementary color part of the colors of a printing color space constructed multi-color are replaced by the black ink. Supporting point data are photometrically acquired from a color scale specifically associated to a printing process. The printing color space is classified into a color model that is independent of a printing color (HSL Model, FIG. 1) and is displayed in this model. A two-dimensional, non-linear deepening field is formed with luminance values (FIG. 2) and a two-dimensional, non-linear desaturation field is formed with saturation values (FIG. 3) that are taken from the original and the substitution of the achromatic part with the black ink is undertaken by an iterative search within the deepening field and within the desaturation field.

REFERENCES:
patent: 4908712 (1990-03-01), Uchiyama et al.
patent: 5084762 (1992-01-01), Miyakawa
patent: 5245419 (1993-09-01), Gu
patent: 5255084 (1993-10-01), Morikawa et al.

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