conventionally , when counterfeit judgment processing by using electronic watermark is performed in a printer driver , a printing speed is lowered due to heavy load . to solve the problem , in the printer driver , first , it is judged whether or not image data indicated by input print information is in high quality . if the image data is in high quality , it is judged whether or not the image data represents a particular image . if the image data represents the particular image , predetermined processing is performed on the image data . this minimizes the execution of counterfeit judgment processing and reduces the load .