Multipass ink jet printing

Tintenstrahldruck mit Mehrfach-Durchlauf

Impression à jet d'encre à passes multiples

Abstract

A printing apparatus and a printing method which eliminate a problem of boundary stripes by taking advantage of features of the multipass printing performed by the printing apparatus without causing a reduction in a throughput. An amount of paper feed for each scan is set to a value which, when multiplied by an integer, is not equal to a printing width covered by a total number of nozzles (1021) in a print head (102), in order to prevent the adjoining of the end portions of print areas of each scan which would otherwise increase the possibility of the boundary stripes being formed at the boundaries and to make the boundaries of the print areas appear at shorter intervals than the paper feed intervals. At the same time, the mask used for the image data to be supplied to the print head in each scan is so set that the mask corresponding to the end nozzle groups among a plurality of nozzle groups have low printing duties.

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