Background pattern image generation program, background pattern image generation device and the background pattern image generating method

摘要

PPROBLEM TO BE SOLVED: To provide a method and a device for generating a tint block printed on an original which enhances the discrimination by increasing the output density of a latent image in a copy while maintaining the hiding properties of the latent image in the original. PSOLUTION: The tint block image generating program generates a tint block image data for forming a tint block image containing a latent image section reproduced at the time of copying and a background section in which the output density decreases at the time of copying on a print medium. The computer executes a latent image section generating process for generating data of a plurality of first dots on the basis of a dot concentration type screen in the latent image section, and a background section generating process for generating data of a plurality of second dots and a plurality of third dots dispersively arranged between the second dots with a size smaller than the second dots in the background section. The first dots in the latent image section and the second dots in the background section are arranged in a common displacement vector position within the region of the tint block image. PCOPYRIGHT: (C)2009,JPO&INPIT