Image processing apparatus and method, and storage medium used therewith

摘要

An image processing apparatus forms an image by using a plurality of light-emitting devices to display each color. The image processing apparatus includes an input unit for inputting image information representing the image, and an adding unit for adding predetermined information to the image information so that the it can hardly be recognized by human eyes. The adding unit is provided corresponding to not all the light-emitting devices but some of the light-emitting devices.