Abstract: Conventionally, acquisition of color values from a color chart takes substantial labor and time. According to this invention, when the color value of each patch composing a predetermined line is input with each line of the color chart composed of a plurality of patches as the measurement unit, a measured line identification processor determines whether or not said line to be measured was measured in the predetermined measurement order, a warning section performs a predetermined warning processing if the measurement order for said line to be measured is no to correct, and when a color value acquisition line correction instruction is input to correct a line whose color value is expected to be acquired in said measurement order, a color value saving section makes the color value of said input each patch correspond to the gradation value of each patch composing said line to be measured.

Abstract: A method of processing cyan, magenta and yellow color values including half-toning cyan and magenta colors values, and half-toning yellow color values in such a manner that yellow dots tend to be printed next to cyan, magenta or secondary color dots regardless of cyan, magenta, or yellow coverages.