| 摘要 |
<p>This invention provides a halftone dot printed product which imparts an anti-forgery function to a continuous-tone image by using four colors of C, M, Y, and Bk, and a method of printing the same. <??>A first halftone region having m x m pixels (m >/= 2, m is an integer) and a second halftone region having n x n pixels (1 </= n < m, n is an integer), where halftone dots to express a continuous-tone image are printed, are laid out. A plurality of first halftone regions in independent regions are 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 P1 which can visually be recognized and is formed by at least one color ink containing no infrared absorptive dye is laid out by using halftone dots in the first halftone region 1. An embedded image P2 such as a character or a face image formed by black (Bk) ink containing an infrared absorptive dye is laid out by halftone dots 3 in the second halftone region. Three color solid images of C, M, and Y containing no infrared absorptive dye are laid out as halftone dots 2 around the image P2 to form a black-based solid image in the second halftone region, thereby printing an embedded image which cannot visually be recognized. <IMAGE></p> |
