System, method, and program for converting three dimensional col

Details System, method, and program for converting three dimensional col System, method, and program for converting three dimensional col

1999-08-10

2000-10-24

Au, Amelia

Facsimile and static presentation processing

Static presentation processing

Attribute control

358529, G03G 1500

Patent

active

061375969

ABSTRACT:
The system, method, and program of this invention is capable of taking as input a three dimensional colorant (e.g., CMY, L*a*b*) and determining an equivalent combination of colors made up of four or more colorants that are used by a given printer. A plurality of patches are printed having predetermined known combinations of varying percentages of three primary colors (e.g., CMY). Another set of patches are printed having predetermined varying percentages of a fourth color (e.g., black). The L*a*b* of these patches are measured. An inversion program is used to determine equivalent CMY component percentage values for the varying percentages of the fourth component based upon similar actually measured L*a*b* values. These determined CMY component percentage values and the known percentages of CMY are used to substitute the fourth colorant (K) for each of the original CMY combinations, known as fourth colorant substitution or black substitution.

REFERENCES:
patent: 5305119 (1994-04-01), Rolleston et al.
patent: 5402253 (1995-03-01), Seki
patent: 5425134 (1995-06-01), Ishida
patent: 5579031 (1996-11-01), Liang
patent: 5631748 (1997-05-01), Harrington
patent: 5774238 (1998-06-01), Tsukada
patent: 5805314 (1998-09-01), Abe et al.
patent: 5917939 (1999-06-01), Ohta et al.

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