To provide an image processor and an image forming device capable of preventing the deterioration of the image quality due to copying by using an electronic watermark technology without using a large scale system.
When a deterioration prevention place is first designated, a driver in a host computer generates PDL (page description language) data about the object at the designated place (1303) and determines whether the data can be embedded in the image data (1304). When the data can be embedded, the driver generates bitmap data for printing about the entire image and embeds the PDL data in the data as electronic watermark information (1305). Then, the driver transmits the generated image data for printing to a printer and makes the printer print the image data. Meanwhile, in the case of copying the printed matter, a copying machine extracts an electronic watermark and interprets the extracted data as PDL data. Then, the generated image data are composed with the original image data to be printed out.
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura