Method for generating color correspondence information capable of reducing consumption amount of colorant consumed in printing

A method for generating color correspondence information correlating a plurality of first color specification values in a first color space with a plurality of second color specification values in a second color space on a one-to-one basis, the color correspondence information being for printing using a plurality of types of colorants, the method comprising:

• acquiring reference color correspondence information correlating L number of first reference color specification values in the first color space with L number of second reference color specification values in the second color space on a one-to-one basis, each of the L number of first reference color specification values including a plurality of first reference color components, each of the L number of second reference color specification values including a plurality of second reference color components, the plurality of second reference color components corresponding to respective ones of the plurality of types of colorants, where L is an integer greater than or equal to two;
• identifying a chroma index indicating a chroma of each of the L number of second reference color specification values;
• executing a modification process to modify Q number of second reference color specification values among the L number of second reference color specification values to obtain Q number of modified second reference color specification values so as to reduce a consumption amount of at least one of the plurality of types of colorants consumed in printing, the Q number of second reference color specification values including one second reference color specification value representing a first color and another second reference color specification value representing a second color, the first color having a first chroma index representing a first chroma, the second color having a second chroma index representing a second chroma lower than the first chroma, the first color and the second color being in a specific hue range, modification of the one second reference color specification value reducing the consumption amount with a first reduction rate, modification of the another second reference color specification value reducing the consumption amount with a second reduction rate smaller than the first reduction rate, where Q is an integer greater than or equal to one and smaller than or equal to L;
• and
• generating color correspondence information correlating the L number of first reference color specification values with L number of determined second color specification values on a one-to-one basis, the L number of determined second color specification values including (L−Q) number of second reference color specification values which are not modified in the modification process and the Q number of modified second reference color specification values which are modified in the modification process.

A method for generating color correspondence information correlating a plurality of first color specification values in a first color space with a plurality of second color specification values in a second color space on a one-to-one basis, the color correspondence information being for printing using a plurality of types of colorants, the method comprising:

• acquiring reference color correspondence information correlating L number of first reference color specification values in the first color space with L number of second reference color specification values in the second color space on a one-to-one basis, each of the L number of first reference color specification values including a plurality of first reference color components, each of the L number of second reference color specification values including a plurality of second reference color components, the plurality of second reference color components corresponding to respective ones of the plurality of types of colorants, where L is an integer greater than or equal to two;
• identifying L number of ellipses corresponding to respective ones of the L number of second reference color specification values in a specific color space, differences in hues of a plurality of colors in each of the L number of ellipses being not easily recognizable;
• identifying a size index indicating a size of each of the L number of ellipses;
• executing a modification process to modify Q number of second reference color specification values among the L number of second reference color specification values to obtain Q number of modified second reference color specification values so as to reduce a consumption amount of at least one of the plurality of colorants consumed in the printing, the Q number of second reference color specification values including one second reference color specification value representing a first color and another second reference color specification value representing a second color, a first ellipse corresponding to the first color, the first ellipse having a first size index indicating a first size, a second ellipse corresponding to the second color, the second ellipse having a second size index indicating a second size smaller than the first size, the first color and the second color being in a specific hue range, modification of the one second reference color specification value reducing the consumption amount with a first reduction rate, modification of the another second reference color specification value reducing the consumption amount with a second reduction rate smaller than the first reduction rate, where Q is an integer greater than or equal to one and smaller than or equal to L;
• and
• generating color correspondence information correlating the L number of first reference color specification values and L number of determined second color specification values, the L number of determined second color specification values including (L−Q) number of second reference color specification values which are not modified in the modification process and the Q number of modified second reference color specification values which are modified in the modification process.