| 摘要 |
PROBLEM TO BE SOLVED: To restrain mutual interference in each color dot and the same color dots in a region to be excessive with a total amount of ink by forming a black color image element by outputting black color recording data equivalent to a lowest level, average level, or a level lower than this in a plurality of recording data. SOLUTION: A specific image element is displaced to black equivalent to the minimum value Lm (the lowest level of a composite black) among cyan, magenta, yellow, and the remaining of a cyan, magenta, yellow ingredient is forcibly displaced in a zero level (00), thereby discharging no ink of each color. Difference between the remaining ingredient of cyan, magenta, yellow and (00) is dispersed in circumferential image elements (A). A multigradation method is employed for this dispersion method. Another method is to be displaced to a mean value La of cyan, magenta, yellow (B). Also, it is displaced to the Ls value of a minimum value or lower among cyan, magenta, yellow. For this displacement rate, a numerical value is used which has a good quality of images and much rate of displacement (C). |
