Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1997-03-25
2000-05-09
Coles, Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
395109, 358529, 358504, 358518, 382167, B41B 1500, G03F 308, H04N 146, G06K 900
Patent
active
06061501&
ABSTRACT:
A system, method, and program of the invention determine a unique combination of four colorants (C'M'Y'K') of a given printer that is equivalent to an externally defined four colorant combination (CMYK) by having the same color values (e.g., L*a*b* values). L*a*b* values associated with each three component combination (CMY) with the fourth component value (K) equal to zero of the externally defined four colorant combination (CMYK) are used in an inversion/interpolation program The printer also prints out a matrix of predetermined varying combinations of the three colorants of the printer (CMY)p with the fourth colorant K equal to zero. L*a*b* values are measured for each patched. These values and the corresponding three colorant combination values are inputted into the inversion/interpolation program. For any given externally defined three colorant combination (CMY), or L*a*b* value, a corresponding three colorant combination (C'M'Y') of the printer can be determined from the inversion/interpolation program by matching L*a*b* values. Then, a fourth colorant, e.g., black, (K) of the externally defined four colorant combination is mapped to an equivalent fourth colorant (K') of the printer by matching color values (e.g., L*). For example, the L* value is found for various percentages of the fourth colorant through standard tables where C=0, M=0, Y=0. The L* value is found for various percentages for the fourth colorant of the printer by printing varying percentages of the fourth component and measuring its L*a*b* values and, assuming a* and b* are near zero, using the L* value. As such, the conversion takes place in two steps, from CMY to C'M'Y' and from K to K'.
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Decker William Chesley
Lee Ho Chong
Zable Jack Louis
Coles Edward L.
International Business Machines - Corporation
Lamb Twyler
Lee Monica D.
Strimaitis R.
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