Image processing apparatus

摘要

An image processing apparatus corrects color-difference amounts of main image information (101) by a plurality of color-difference amount correction processes (S12a to S12n) and performs a plurality of color-difference modulation processes (S13a to S13n) based on the processing results of the plurality of color-difference amount correction processes (S12a to S12n) and a plurality of key information items (103a to 103n). Further, it subjects the processing results of the plurality of color-difference modulation processes (S13a to S13n) to the selecting/synthesizing process (S14) based on sub-information (102) and superposing the processing result of the selecting/synthesizing process (S14) on the main image information to form synthesized image information (111) having sub-information embedded in an invisible state in the main image information.