Patent ID: 8711436

Claim:
A non-transitory computer-readable medium which stores a tint block image generation program for causing a computer to execute a tint block image generation step of generating tint block image data which forms, on a print medium, a tint block image including a latent image portion and a background portion, having different output densities to be reproduced by copying, wherein the tint block image generation step comprises: a first screen processing step of generating latent image portion image data by an area modulation screen having a first screen ruling, for pixels of the latent image portion; and a second screen processing step of generating background portion 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 background portion, and wherein in the first screen processing step, the latent image portion image data is generated to form a halftone dot at a center of gravity position of an image of the latent image portion in a cell corresponding to a halftone dot formation area in the area modulation screen, when the image of the latent image portion and the image of the background portion exist in the cell.