Image processing device, image processing program, image processing method and data structure for data conversion

摘要

An image processing apparatus, an image processing program and an image processing method for forming a composite image by superimposing an overlay image on a base image. When all the CMYK planes in a block of the overlay image have a gray level of 0, the gray levels of all the CMYK planes are set to 0 for the corresponding block. When at least one of the CMYK planes in a block of the overlay image has a gray level not less than 1, the gray level of the other planes, which are 0, are set to an invisible gray level for the corresponding block, and the gray level of the plane, which is not less than 1, is kept for the corresponding block.