When inkjet printers print images, they need to carry out a series of complicated procedures. When the printer nozzle quickly sweeps the print paper, the innumerable nozzles on it will spray innumerable small ink droplets, thus forming the pixels in the image. There are generally 48 or more independent nozzles on the printer head to spray ink of different colors.

The ink-jet printer turns the color liquid ink into fine particles through the nozzle and sprays them onto the printing paper. Some ink-jet printers have three or four print nozzles to print yellow, magenta, cyan and black; Some of them share a common nozzle, which is divided into four colors.