Color converting apparatus and color converting method for designated-color printing, and computer readable recording medium

A method of converting color for designated-color printing, the method comprising:

• a color-space converting step of converting a designated-color designated by a printing command to a converted-color in a color space represented by brightness, saturation, and hue of color;
• a color classifying step of classifying the converted-color to one of plural classified-colors based on the brightness, saturation, and hue of said converted-color;
• a classified-color/printing-color correlating step of selecting one printing color correlated with the one classified-color from among one or more printing colors, based on color correlating-relationship information, wherein the color correlating-relationship information sets a correlating relationship between the plural classified-colors and one or more printing colors, and of correlating the selected printing color with said printing command;
• a halftone controlling step of calculating a first printing density of the one printing color based on the brightness of the classified-color in the color space and setting the calculated first printing density to the one printing color;
• and
• a color determining step of determining whether the classified-color is one of black and gray;
• wherein the halftone controlling step comprises (i) calculating the first printing density with a whole range of the brightness being controlled as a halftone in a case in which the color determining step determines that the classified-color is one of black and gray, and (ii) calculating the first printing density with a partial range of the whole range of the brightness being controlled in a case in which the color determining step determines that the classified-color is not one of black and gray.

A non-transitory computer-readable storage medium with an executable program stored thereon, wherein the program is executable to control a computer to perform functions comprising:

• a color-space converting step of converting a designated-color designated by a printing command to a converted-color in a color space represented by brightness, saturation, and hue of color;
• a color classifying step of classifying the converted-color to one of plural classified-colors based on the brightness, saturation, and hue of said converted-color;
• a classified-color/printing-color correlating step of selecting one printing color correlated with the one classified-color from among one or more printing colors, based on color correlating-relationship information, wherein the color correlating-relationship information sets a correlating relationship between the plural classified-colors and one or more printing colors, and of correlating the selected printing color with said printing command;
• a halftone controlling step of calculating a first printing density of the one printing color based on the brightness of the classified-color in the color space and setting the calculated first printing density to the one printing color;
• and
• a color determining step of determining whether the classified-color is one of black and gray;
• wherein the halftone controlling step comprises (i) calculating the first printing density with a whole range of the brightness being controlled as a halftone in a case in which the color determining step determines that the classified-color is one of black and gray, and (ii) calculating the first printing density with a partial range of the whole range of the brightness being controlled in a case in which the color determining step determines that the classified-color is not one of black and gray.