Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1997-10-15
1999-12-28
Powell, Mark R.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358406, 358448, 358504, 358518, 358520, 358523, 358531, 358537, 382162, 382167, 348179, H04N 146
Patent
active
060089075
ABSTRACT:
A system and method for calibrating a printer includes the steps or functions of: printing a predetermined color test pattern with the printer by transforming data, representing said predetermined color test pattern, from a device-independent color space to a device-dependent color space associated with the printer by use of a color transform, said predetermined color test pattern including a set of color patches with one of said color patches representing a preferred mid-gray hue; providing a predetermined reference gray surface; comparing said reference gray surface to said set of colored patches of the printed test pattern to find a closest matching one of said patches, if the closest matching one of said patches is the patch representing the preferred mid-gray hue, then ending the method; otherwise determining, for each color channel of the printer, a solution set of correction values as a function of believed gray versus actual gray, said solution set derived from and including a white point, a black point and a point mapped at {G.sub.b, G.sub.a } where G.sub.b is the believed gray value of the closest matching one of said patches and G.sub.a is the actual gray value of the closest matching one of said patches; and adding to the color transform the corresponding solution set for each color channel of the printer.
REFERENCES:
patent: 4310248 (1982-01-01), Meredith
patent: 5313291 (1994-05-01), Appel et al.
patent: 5539540 (1996-07-01), Spaulding et al.
patent: 5638117 (1997-06-01), Engeldrum et al.
patent: 5721623 (1998-02-01), Boxma
International Color Consortium Profile Specification, Version 3.3, Nov. 1996.
Hultgren, III Bror O.
Thornton Jay E.
Vigneau Michael J.
Decker Robert J.
Polaroid Corporation
Powell Mark R.
Sabourin Robert A.
Sealey Lance W.
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