An image formation method for forming an image on a medium by discharging a liquid from a head, the head having a plurality of nozzles arranged in a first direction and a plurality of actuators corresponding respectively to the plurality of nozzles, the method comprising: discharging the liquid onto the medium from the plurality of nozzles by applying a first voltage to the plurality of actuators while performing relative displacement between the head and the medium in a second direction intersecting the first direction; and applying a second voltage higher than the first voltage to an actuator, of the plurality of actuators, corresponding to a correction nozzle, based on information identifying a discharge defect nozzle being a nozzle, of the plurality of nozzles, unable to discharge the liquid normally, the correction nozzle being a nozzle, of the plurality of nozzles, adjacent to the discharge defect nozzle in the first direction characterised in that: the applying of the first voltage to the plurality of actuators is performed by connecting the plurality of actuators to a first power source; and the applying of the second voltage to the actuator corresponding to the correction nozzle is performed by connecting the actuator corresponding to the correction nozzle to a second power source different from the first power source, an output voltage of the second power source being larger than an output voltage of the first power source; the applying of the second voltage to the actuator corresponding to the correction nozzle is performed based on a waveform signal indicating a timing for applying the second voltage; and a shape of the waveform signal is identical to a shape of a waveform signal for the correction nozzle to be used in a case that the correction nozzle was not identified as a correction nozzle. discharging the liquid onto the medium from the plurality of nozzles by applying a first voltage to the plurality of actuators while performing relative displacement between the head and the medium in a second direction intersecting the first direction; and applying a second voltage higher than the first voltage to an actuator, of the plurality of actuators, corresponding to a correction nozzle, based on information identifying a discharge defect nozzle being a nozzle, of the plurality of nozzles, unable to discharge the liquid normally, the correction nozzle being a nozzle, of the plurality of nozzles, adjacent to the discharge defect nozzle in the first direction characterised in that: the applying of the first voltage to the plurality of actuators is performed by connecting the plurality of actuators to a first power source; and the applying of the second voltage to the actuator corresponding to the correction nozzle is performed by connecting the actuator corresponding to the correction nozzle to a second power source different from the first power source, an output voltage of the second power source being larger than an output voltage of the first power source; the applying of the second voltage to the actuator corresponding to the correction nozzle is performed based on a waveform signal indicating a timing for applying the second voltage; and a shape of the waveform signal is identical to a shape of a waveform signal for the correction nozzle to be used in a case that the correction nozzle was not identified as a correction nozzle. the applying of the first voltage to the plurality of actuators is performed by connecting the plurality of actuators to a first power source; and the applying of the second voltage to the actuator corresponding to the correction nozzle is performed by connecting the actuator corresponding to the correction nozzle to a second power source different from the first power source, an output voltage of the second power source being larger than an output voltage of the first power source; the applying of the second voltage to the actuator corresponding to the correction nozzle is performed based on a waveform signal indicating a timing for applying the second voltage; and a shape of the waveform signal is identical to a shape of a waveform signal for the correction nozzle to be used in a case that the correction nozzle was not identified as a correction nozzle.