Printing system and method of printing

Abstract

The present invention prevents deterioration of the picture quality due to a deviation of dot-forming positions on each raster line without lowering the printing speed. In a printing system of the present invention, a print head of each color has a plurality of nozzle groups arranged in parallel in a main scanning direction. The number of nozzle groups is equal to N1 and each nozzle group includes a plurality of nozzles aligned in a sub-scanning direction. An interval between the adjoining nozzle groups in the main scanning direction is set equal to a pitch of k1 dots, which is prime to the number of nozzle groups N1. The printing system of the present invention scans the print head thus constructed in the main scanning direction and drives the plurality of nozzle groups simultaneously on the print head to record dots every time when the print head shifts by N1 pixels in the main scanning direction. This structure enables each raster line in the main scanning direction to be recorded by different nozzles in one main scan. This causes a deviation of dot-forming positions due to a distribution of ink-spouting characteristics of the individual nozzles to be effectively dispersed on each raster line and thereby improves the picture quality of a resulting printed image. The structure does not increase the number of main scans required to form each raster line, thus not lowering the printing speed.

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