| 摘要 |
<p>PURPOSE:To surely prevent a card recording body from being forged or altered by respectively making the extraction of photographic image and the connection of photographic image after extraction difficult by a method wherein the photographic image having background color is formed on the top surface of the base material of a card and, at the same time, the boundary profile of the photographic image is formed under the condition that the boundary profile is formed so as to have density gradient from the background color. CONSTITUTION:In a card recording body 1 such as an identification card or the like, a photographic image 3 and character images 4 are formed on the top surface of the base material of a card 2. Further, as the photographic image, a portrait 3 is formed against background color 5. Concretely, after the photographic image 3 having the background color 5 is formed on the top surface of the base material of the card 2, the boundary profile 7 of the photographic image 3 is formed under the condition that the boundary profile 7 is formed so as to have density gradient from the background color 5. Accordingly, in order to change the portrait 3, the extraction of the portion of the boundary profile 7 is inevitable. In this case, since the boundary profile 7 is not clear due to the density gradient, the extraction can be made difficult. And, even when the extraction of the boundary profile 7 is realized, the density matching between the extracted boundary profile 7 and connecting portion is difficult. Consequently, the forgery and alteration of the car card recording body 1 can be surely prevented from developing.</p> |
