| 摘要 |
PROBLEM TO BE SOLVED: To enable the newly printed surface of a paper to be discriminated at a glance even when both surfaces of the paper are printed by executing printing processing by using a sub-color such as red or blue other than black being a base color when the paper whose back surface is already used is supplied. SOLUTION: By the set of an operation display part 11, the printing processing is started. In the case that the paper is not the paper whose back surface is already used, the normal printing processing is executed. That means, a printing instruction is sent to a first writing part 14 by an image processing part 13. In the case of the paper whose back surface is already used, the printing instruction is not sent to the first writing part 14 for the printing of the black color being originally the base color but it is sent to a second writing part 15 for the printing of the sub-color from the processing part 13. Then, the paper whose back surface is already used and which is outputted to be printed is printed by the red or the blue being the sub-color and the printing processing thereof is finished. By executing the printing processing by using the sub-color, the newly printed surface of the paper can be discriminated at a glance even when both surfaces of the paper are printed. |
