| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is difficult to add additional information to image information such that the additional information can be interpreted more reliably without causing deterioration of image quality. SOLUTION: Based on a print density value detected by a printer engine 400, a section 3016 for determining an information adding method determines an adding method. By controlling an adding method switching section 3006 and an add on pattern switching section 3011, an optimal one of add on patterns generated from add on pattern generating sections 3012-3014 can be added by an optimal method among information adding sections 3007-3009. |
