Abstract: A halftone dot printed product which imparts an anti-forgery function to a continuous-tone image by using four colors of Cyan, Magenta, Yellow, and Black, and a method of printing the same are disclosed. The product and method include a first halftone region having m×m pixels and a second halftone region having n×n pixels, where halftone dots to express a continuous-tone image are printed, are laid out. A plurality of first halftone regions in independent regions are disposed tightly around one second halftone region. A plurality of second halftone regions are laid out along the outer periphery of one first halftone region at an equal interval. An embedded image is formed by at least one color ink containing no infrared absorptive dye and is laid out by using halftone dots in the first halftone region 1. An embedded image is formed by black ink containing an infrared absorptive dye and is laid out by halftone dots 3 in the second halftone region.

Abstract: A halftone dot printed product which imparts an anti-forgery function to a continuous-tone image by using four colors of Cyan, Magenta, Yellow, and Black, and a method of printing the same are disclosed.