| 摘要 |
In a case of forming an image of a black ink (Bk) a low concentration colored ink (light C) having an opposite polarity to that of the black ink is added thereto in an overlaying manner. Then, the deviation can be made visually unrecognized for the low concentration of the colored ink even if the overlaid condition of inks is not within a predetermined range. In addition to an increase in density due to insolublization of the black ink, this increase in the density of the black image can be achieved within a range in which no change is recognized in the hue. More specifically, a relation between an optical density according to a dye concentration of cyan ink (C) or a thinning rate of cyan dots and permissible deviation to print quality is examined in advance, and the dye concentration or thinning rate of cyan ink is set in order to determine an optical density of cyan ink according to predictable or existing deviation on a printer. <IMAGE> <IMAGE> <IMAGE> <IMAGE> |
