The present invention introduces a location determining system. Provided in a discharge roller portion that discharges paper from the paper post-processing portion to a discharge tray are a drive roller, and a first idler roller and second idler roller that form a pair with the drive roller and can be selectively used when discharging paper to the discharge tray. The color model value for each pixel in the saturation region is then adjusted by a corresponding adjustment. Thus the stroke L of transfer head 1 needed for the nozzle exchange is significantly reduced, and the nozzle may be replaced within a short time. A circular waveguide formed within of the inner conductive tube supports a second frequency band. A bridge is disposed between the first electrode and the piezoelectric layer.