Reduction of dependence of color appearance on light source

Details Reduction of dependence of color appearance on light source Reduction of dependence of color appearance on light source

2005-02-08

2005-02-08

Nguyen, Lamson (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S015000, C358S001900, C358S003230

Reexamination Certificate

active

06851794

ABSTRACT:
A look up table LUT with specific gray reproduction characteristics is used for converting RGB image data to multi-tone data of ink colors. The gray reproduction characteristics of LUT are set such that the color difference ΔE of a gray color area with an arbitrary tone level in the L*a*b* color system is kept at about 4 or less, assuming that the results are observed under two different light sources, such as standard light D50and standard light A, respectively.

REFERENCES:
patent: 6690489 (2004-02-01), Jacob et al.
patent: 6783203 (2004-08-01), Fujimori

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