System to improve printer gamut

Details System to improve printer gamut System to improve printer gamut

1996-03-13

1998-01-20

Coles, Sr., Edward L.

Image analysis

Color image processing

382167, 395109, 358518, 358520, G06K 900, B41B 1500, G03F 308

Patent

active

057108242

ABSTRACT:
In a printer which produces images as a function of the combination of cyan (C), magenta (M), yellow (Y) and black (K) colorants on an output color print, responsive to device independent colorimetric description of an image, there is provided a method of printing in a color printer so that scanned color images defined in terms of colorimetric color signals may be printed on a color printer responsive to printer colorant signals to render a color print with a set of three primary colorants and black on a substrate, the printing method comprising the ordered steps of scanning an image to derive a set of device independent colorimetric color signals, converting said colorimetric color signals into device dependent primary colorant signals, each primary colorant signal defining a density of colorant to be used in rendering a color print, said conversion accounting for a subsequent black colorant addition, determining, for minimum and maximum values of the combination of primary colorant signals a black colorant signal, to add black colorant as a nonlinear function of the primary colorant signals so as to expand the printable color gamut, to the color print, gray balancing the primary colorant signals and linearizing black to generate a set of corresponding printer colorant signals to control the printer and using said printer colorant signals to control the printer to produce an image colorimetrically matching the scanned image.

REFERENCES:
patent: 2790844 (1957-04-01), Neugebauer
patent: 4275413 (1981-06-01), Sakamoto et al.
patent: 4500919 (1985-02-01), Schreiber
patent: 5305119 (1994-04-01), Rolleston et al.
patent: 5592311 (1997-01-01), Hibi
Shepard's Method of "Metric Interpolation" to Bivariate and Multivariate Interpolation, by: Gordon and Wixom Mathematics of Computation, vol. 32, No. 141, Jan. 1978, pp. 253-264.
Printing CIELAB Images on a CMYIL Printer Using Tri-Linear Interpolation By: Nin, Lasson, Plouffe.
Colorimetric Calibration for Scanners & Media By: Hung.
Tetrahedral Division Technique Applied to Colorimetric Calibration for Imaging Media By: P. Hung.

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