Printing method, printing apparatus, printing system, and storage medium

A printing method comprising:

• generating a drive signal for driving a piezo element by selecting, based on print data, either
• a first original drive signal having a unit signal for defining the start to the end of an operation of causing said piezo element to eject ink by changing a voltage of said piezo element using a first reference voltage as a reference, or
• a second original drive signal having a unit signal for defining the start to the end of an operation of causing said piezo element to eject ink by changing the voltage of said piezo element using a second reference voltage as a reference;
• ejecting ink using said piezo element by applying the generated drive signal to said piezo element to charge and discharge said piezo element;
• and
• charging said piezo element so that the voltage of said piezo element attains either said first reference voltage or said second reference voltage during a predetermined period during which neither said first original drive signal nor said second original drive signal is selected;
• wherein a plurality of piezo elements are provided as said piezo element;
• wherein said predetermined period is a period during which said first original drive signal is equal to said first reference voltage and said second original drive signal is equal to said second reference voltage;
• and
• wherein said piezo element is charged
• according to a charge instruction signal for charging all the piezo elements which can be driven based on said drive signal
• during said predetermined period within a single pixel period during which ink for forming a pixel is ejected,
• said pixel constituting an image to be printed,
• before said unit signal in said drive signal is output
• so that the voltage of said piezo element attains the reference voltage of either one of said first original drive signal and said second original drive signal which is to be selected next.