Patent ID: 6305775
Filing Date: 2001-10-23
Classification: B41J,G06K

Abstract:
An ink-jet printing apparatus for printing an image on a print medium by discharging ink from each of a plurality of printing elements of a printhead, comprising:ink-discharge means, provided with each of the plurality of printing elements, for discharging of an alternative amount of ink from each of the printing elements of the printhead;modulate means for modulating image data to generate print data for each pixel in order to print dots by using said ink-discharge means, including at least one small dot and/or large dot, corresponding to density of the image data;timing control means for determining a plurality of ink discharge timings in a printing cycle for each pixel, where at each ink discharge timing, the amount of ink which has been altered by said ink-discharge means is discharged; andcontrol means for outputting print data generated by said modulate means to the printhead in synchronization with each corresponding ink discharge timing determined by said timing control means,wherein said modulate means generates the print data such that the print head discharges the alternative amount of ink in the plurality of ink discharge timings based on the print data in an area in which the density of the image data changes.