US 2010/0166306 A1 · COLOR CONVERSION TABLE CREATING DEVICE

Abstract

A color conversion table creating device for creating a color conversion table for converting first color data defined in a first color space to second color data defined in a second color space different from the first color space, includes a first data acquiring unit, a reference value determining unit, a lightness judging unit, a third data determining unit, and a creating unit. The first data acquiring unit is configured to acquire a plurality of sets of first data defined in the first color space. The first data sets are determined by measuring test patches each corresponding to a set of second data defined in the second color space. The first data sets include a set of black color data corresponding to data representing black in the second color space. Each first data set has a lightness value. The reference value determining unit is configured to determine a reference value based on a lightness value of the black color data set. The lightness judging unit is configured to judge, for each first data set, whether or not a lightness value of the subject first data set is smaller than the reference value. The third data determining unit is configured to determine the first data set as a set of third data when the lightness judging unit judges that the lightness value of the first data set is smaller than the reference value. The creating unit creates a color conversion table based on the first data sets excluding the third data set.

Claims18

Dependent claims

a first data acquiring unit that is configured to acquire a plurality of sets of first data defined in the first color space, the first data sets being determined by measuring test patches each corresponding to a set of second data defined in the second color space, the first data sets including a set of black color data corresponding to data representing black in the second color space, each first data set having a lightness value;
a reference value determining unit that is configured to determine a reference value based on a lightness value of the black color data set;
a lightness judging unit that is configured to judge, for each first data set, whether or not a lightness value of the subject first data set is smaller than the reference value;
a third data determining unit that is configured to determine the first data set as a set of third data when the lightness judging unit judges that the lightness value of the first data set is smaller than the reference value;
and
a creating unit that creates a color conversion table based on the first data sets excluding the third data set.

3 more elements

A computer-readable recording medium that stores a color conversion table creating program for creating a color conversion table for converting first color data defined in a first color space to second color data defined in a second color space different from the first color space, the color conversion table creating program comprising instructions for:

(a) acquiring a plurality of sets of first data defined in the first color space, the first data sets being determined by measuring test patches each corresponding to a set of second data defined in the second color space, the first data sets including a set of black color data corresponding to data representing black in the second color space, each first data set having a lightness value;
(b) determining a reference value based on a lightness value of the black color data set;
(c) judging, for each first data set, whether or not a lightness value of the subject first data set is smaller than the reference value;
(d) determining the first data set as a set of third data when the lightness value of the first data set is smaller than the reference value;
and
(e) creating a color conversion table based on the first data sets excluding the third data set.

3 more elements

Dependencies are inferred from the claim text.

Color conversion table creating device

Life of this patent

Color conversion table creating device

Life of this patent

Abstract

Claims18