With piezoelectric printers, the print head is part of the printer, not the ink cartridge. A device called a transducer forces ink into the print head. A small electrical charge is then applied to transfer that ink to the page. These printers create smaller ink droplets in the printing process. Resolution is measured by the DPI used to create characters.
Resolution determines the amount of ink used to create a single dot.
Higher DPI settings allow for more ink in each character. Printer-head alignment is critical to quality output and is performed when you first connect a new printer to your computer. Because most printers use ink cartridges that contain the print heads, alignment should be done again every time you install a new ink cartridge. Half-toning and dithering control the relative position of the dots formed on your page. Most printer manufacturers would like us to believe that there is a single source for printer ink.