An image processing system, a computer readable medium, a printing device and a reading device are provided. The image processing system includes an operation unit which receives commands; a setting unit which performs setting processing for setting, in accordance with the commands received by the operation unit, a performance condition including an independent setting item, the independent setting item comprising first and second fields for setting different values, respectively, for the front side and the back side of a sheet material; and a performance unit which processes the front side and the back side of the sheet material in accordance with the performance condition set by the setting unit. The printing device includes a print unit that performs double-sided printing on a sheet material; the operation unit; the setting unit; and a control unit that controls the print unit to perform double-sided printing in accordance with the print condition.