A selecting means of the lowdensity nozzles and the high-density nozzles, and a delaying means for a nozzle movement-commanding signal are installed at a printer-controlling device, and it selects the low-density nozzles and the high-density nozzles based on homogeneity of received plural image element signals. プリンタの制御機に低密度ノズルと高密度ノズルの選択手段とノズル作動指令信号の遅延手段とを設け、受取った複数の画素信号の同一性に基づいて低密度ノズルと高密度ノズルを選択する。 - 特許庁