Importance

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Abstract

In an ink jet printing apparatus that adopts an area grayscale system using halftone elements, degradation of grayscale reproducibility caused by a plurality of dots pulling each other on a print medium can be prevented, and thereby stable grayscale and color reproducibility can be realized. To this end dots to be applied to halftone elements, whose arrangement is determined by the halftone element-based area grayscale system, are divided into a dot group for interior halftone elements and a dot group for outline halftone elements. These two dot groups are printed with a predetermined time difference between them. The subsequent dots are then drawn to the preceding dots that are not yet absorbed in the print medium. Therefore, the overall shape and grayscale level of the merged dot in each pixel become stable, allowing for reliable image processing which in turn realizes excellent grayscale and color reproducibility.

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First Claim