Canon Information Systems, Inc.

Gesualdo Alesii

Brigitte Ruetz

Timothy I Kohler

A method and apparatus for constructing a color printer table. Printable colors in CIELAB space are transformed to Munsell space and color mapping functions are derived which map Munsell space coordinates into primary color coordinates CMY of the printer. A Munsell printer gamut is determined by selecting points in Munsell space where the color mapping functions result within the printable primary color range. All discrete points of an extended gamut in CIELAB space are mapped into the Munsell space. The extended gamut comprises colors inside the printer gamut as well as colors outside the printer gamut, such as colors typically found in a color monitor. Primary color values are inserted into the color printer table by taking the mapped CIELAB points and applying the color mapping functions to the mapped CIELAB points that lie inside the Munsell printer gamut, and applying gamut mapping to the mapped CIELAB points in Munsell space that lie outside the Munsell printer gamut. Since the gamut mapping takes place in Munsell space, the hue is exactly preserved by simply preserving the hue angle.

Growing community of inventors

San Jose, CA, United States of America

Gesualdo Alesii