Adding the data of the tint block pattern which includes the reproduction control pattern where is drawn up the printing data preparation device, printing data preparation method, you grasp optically at the time of computer reading possible

摘要

PPROBLEM TO BE SOLVED: To discriminate whether to be an original or a copy by printing print data with ground tint data superimposed on the print data, and to prevent a document duplicated with a ground tint included from being used. PSOLUTION: A plurality of printing ports 13 for ground tint pattern attachment for attaching ground tint pattern data to the print data and outputting the print data attached with the ground tint patten data to a printer 8 are prepared in a host device 1, the ground tint patters to be attached in the respective printing ports 13 for ground tint pattern attachment are made respectively different, and a printing port selection processing part 12 automatically switches the printing ports 13 for ground tint pattern attachment to be selected in each prescribed period. As a result of this, for example, when a period is set daily, a forged document can be discriminated to be a forged one by checking the ground tint pattern even though the forged document obtained by using an original ahead of one day to change its date into the date of that day is prepared. PCOPYRIGHT: (C)2005,JPO&NCIPI