| 摘要 |
<p>PROBLEM TO BE SOLVED: To make density adjustments so that density differences between ink heads become small in all density layers without generating any void part.SOLUTION: A density adjustment control part 31a prints density adjustment patterns and reads the respective printed density adjustment patterns to calculate adjustment values of respective density layers. A drive voltage control part 31c adjusts density between a plurality of ink heads 12 by controlling a drive voltage of each ink head 12 on the basis of an adjustment value of the density layer having the thinnest density. A half-tone control part 31 adjusts density by changing the number of droplets discharged from respective nozzles of the plurality of ink heads 12 through half-tone processing on the basis of adjustment values of respective density layers other than the density layer having the thinnest density and the adjustment value of the drive voltage control means.</p> |
