Patent ID: 7168776

Claim:
A printing apparatus comprising: at least two ink-ejecting section units, each of said ink-ejecting section units having a plurality of ink-ejecting sections, each of said ink-ejecting sections being provided for ejecting an ink of a different color from among a plurality of colors, each of said ink-ejecting sections ejecting the ink based on a gradation value that has been converted; a memory for storing darkness-correspondence information that correlates, for each of said plurality of colors of ink, darkness of images each printed using a different one of a plurality of predetermined ink-ejecting sections, said predetermined ink-ejecting sections each having an ink-ejection amount different from one another, and a darkness of an image printed using a reference amount of ink; and a converting section for converting, for every pixel, a gradation value of image data to be printed, based on a correlation in said darkness-correspondence information between a darkness of an image printed using the predetermined ink-ejecting section that ejects an amount of ink that corresponds to an average value of the ink-ejection amounts respectively ejected from said plurality of ink-ejecting sections, and said darkness of said image printed using said reference amount of ink.