Method and apparatus for printing high fidelity color reproducti

Details Method and apparatus for printing high fidelity color reproducti Method and apparatus for printing high fidelity color reproducti

1992-10-05

1996-03-19

Bayerl, Raymond J.

395131, G06K 1500, H04N 146

Patent

active

055009212

ABSTRACT:
A method and apparatus for building and using tables which determine the colors to be printed from a device independent color coordinate system. Two tables are built: the first is a printer table for colors in the printer gamut as well as for colors in a typical color monitor gamut, and the second is a border table for colors outside the printer table. The printer table is constructed from a mathematically smooth mapping function for mapping from the device independent coordinate system (such as CIELAB space) to the printer coordinate system, and the mathematically smooth mapping function is determined based on a measurement of the printable colors in the device independent coordinate system. The border table is constructed so as to preserve the hue of unprintable colors but to increase saturation so as to achieve a more natural looking result. Transition colors are added to the printer table outside the printer gamut, smoothing the transition from the edge of the printer gamut to the border table. In use, either the printer table or the border table is selected based on whether the desired color in the device independent coordinate system is within the printer table or outside the printer table.

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"Color Gamut Matching For Hard Copy", J. Meyer, et al., 1989 SID International Symposium, Digest of Technical Papers, vol. 20, May 18, 1989, pp. 86-89.

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