Printing method and printing apparatus

A printing apparatus comprising:

• a liquid ejecting head including:
• a channel substrate having an individual channel;
• and a piezoelectric actuator having an individual electrode, a high potential electrode, and a low potential electrode, and configured to apply pressure to liquid inside the individual channel;
• a driving power source circuit electrically connected to the individual electrode;
• a high potential power source circuit electrically connected to the high potential electrode;
• a conveyor configured to convey a medium;
• and
• a controller configured to control the liquid ejecting head and the conveyor,
• wherein the controller is configured to:
• eject the liquid from the liquid ejecting head with respect to the medium conveyed by the conveyor so as to print an image on the medium;
• and
• change an output voltage value of the driving power source circuit and an output voltage value of the high potential power source circuit while printing the image on the medium.