Head controller, inkjet recording apparatus, and image recording apparatus that prevent degradation in image quality due to environmental temperature changes

One kind of head controller controls pressure generating means, the pressure generating means for pressurizing compartment volume contraction and expansion, the pressurizing compartment communicating with a nozzle of the droplet discharge head. Drive waveform generating means outputs a drive pulse, the drive pulse includes at least: a first waveform element, so that the first waveform element expanding the compartment; second waveform element, the second waveform element maintaining the expanded state of the compartment; and a third waveform elements, so that the third compartment contraction waveform element to expel droplets. When the first potential difference being a potential difference between the first waveform element at the expansion starting and the second waveform element, and the second potential difference is a potential difference between the third waveform element at the end of the contraction and the second waveform element, when the ambient to reduce the difference between the first and the second electrical potential difference when the temperature is higher than a first predetermined temperature, the difference increases between the first and the second electrical potential difference when the ambient temperature is below a second predetermined temperature.