Patent ID: 7222928

Claim:
A printer control unit to control printing by a printing apparatus with a plurality of nozzles capable of high-resolution printing which squirt ink droplets onto individual pixels, said printer control unit being configured to create, from high-resolution image data, low-resolution image data in which neighboring pixels in said high-resolution image data are made into one pixel, and squirt ink droplets onto individual pixels for high resolution according to the resulting low-resolution image data, thereby printing low-resolution pixels comprising a plurality of high-resolution pixels, said printer control unit being characterized in that: said plurality of nozzles is divided into sections which squirt a plurality of color inks differing in darkness; each of said low-resolution pixels is comprised of a plurality of adjacent high-resolution pixels, and the plurality of adjacent high-resolution pixels is squirted with ink droplets according to the low-resolution image data in common; and the plurality of nozzles assigned to said plurality of adjacent high-resolution pixels belongs to each of the sections, with each of the sections being assigned with a color ink having a different darkness.