Printing apparatus and method for calibrating input voltage in printing apparatus

A printing apparatus that performs printing on a medium, comprising:

• a print chip that has a first nozzle group through which ink is discharged in accordance with a commonly used input voltage;
• a print controller that controls the print chip to print, on the medium, a test image containing a first test region which is printed upon input of a first voltage as the input voltage and a second test region which is printed upon input of a second voltage as the input voltage, the second voltage being different from the first voltage;
• an image capturing unit that image-captures each of a plurality of regions having a region containing the first test region and a region containing the second test region, which are formed by dividing the test image printed on the medium;
• a density detector that detects a density of a first detection target region as at least a part of the first test region in a captured image provided by image capturing by the image capturing unit and a density of a second detection target region as at least a part of the second test region in the captured image;
• and
• a voltage calibrator that calibrates the input voltage based on the density of the first detection target region, the density of the second detection target region, a value of the first voltage, and a value of the second voltage,
• wherein a position of the first detection target region in the captured image and a position of the second detection target region in the captured image are identical to each other.