| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a program and a device for generating a forgery suppressed tint block in which original concealment capability is improved. <P>SOLUTION: An image generation device generates, on a print medium, an image including a first image portion and a second image portion. The device has a first screen processing means which generates image data by an area modulation screen having a first screen ruling, for pixels of the first image portion; and a second screen processing means which generates image data by an area modulation screen or a density modulation screen having a second screen ruling which is higher than the first screen ruling for pixels of the second image portion. Then the first screen processing means generates a halftone dot at the center of gravity position of an image of a latent image portion in a cell corresponding to a halftone dot formation area in the area modulation screen processing. <P>COPYRIGHT: (C)2009,JPO&INPIT |
