Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Color Gamut Expansion

IP.com Disclosure Number: IPCOM000118948D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Decker, WC: AUTHOR [+3]

Abstract

A methodology for obtaining a color rendering dictionary involves the use of black substitution and under color addition. In this manner device independent color coordinates, L sup *, a sup *, b sup *, are expressed in terms of the percents of cyan, magenta, yellow, and black.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Color Gamut Expansion

      A methodology for obtaining a color rendering dictionary
involves the use of black substitution and under color addition.  In
this manner device independent color coordinates, L sup *, a sup *, b
sup *, are expressed in terms of the percents of cyan, magenta,
yellow, and black.

      Using this methodology, one can determine the surface or
boundary of the printers color gamut.  However, examining the C,M,Y,
and K values on the gamut surface, it is apparent that the values of
C,M,Y, and/or K can be increased at any surface point.  In some of
these boundary points, increasing C,M,Y, and/or K will create ne L
sup * a sup * b sup * that are inside the gamut.  However, for others
the L sup *a sup *b sup * values will lie outside the gamut.  In
these instances, a color larger gamut has been created by using all
those points that lie outside the original gamut.  These new points
are added to the color rendering dictionary to create a larger color
gamut for the printer.