Patent ID: 7901028
Filing Date: 2011-03-08
Classification: B41J

Abstract:
1. A method of calculating a correction value, the method comprising: forming a first test pattern on a medium by using a first nozzle group and a second nozzle group of a liquid discharging device including a nozzle row, in which a plurality of nozzles for discharging liquid is aligned in a predetermined direction, having the first nozzle group, the second nozzle group, and a third nozzle group; forming a second test pattern on the medium by using the second nozzle group and the third nozzle group of the liquid discharging device; setting the first test pattern in a scanner, acquiring a read-out result of a portion formed by the first nozzle group from a read-out result of the first test pattern as a first read-out gray scale value, and acquiring a read-out result of a portion formed by the second nozzle group from a read-out result of the first test pattern as a second read-out gray scale value; setting the second test pattern other than the first test pattern in the scanner, acquiring a read-out result of a portion formed by the second nozzle group from a read-out result of the second test pattern as a third read-out gray scale value, and acquiring a read-out result of a portion formed by the third nozzle group from a read-out result of the second test pattern as a fourth read-out gray scale value; calculating an average gray scale value that is an average value of the second read-out gray scale value and the third read-out gray scale value; and calculating a correction value of the second nozzle group based on the average gray scale value; wherein the first nozzle group, the second nozzle group, and the third nozzle group are aligned in the described order from one side in the predetermined direction, and wherein, in the calculating of an average gray scale value, an average value of the second read-out gray scale value, from which the read-out result of the first test pattern formed by the nozzle of the second nozzle group that is located in an end portion on the other side is excluded, and the third read-out gray scale value, from which the read-out result of the second test pattern formed by the nozzle of the second nozzle group that is located in an end portion on the one side is excluded, is calculated as the average gray scale value.