| 摘要 |
When a halftone dot image structure reproduction mode is selected in a proof image data generating apparatus, color image data are generated using threshold matrixes having respective screen angles which are essentially equal to the screen angles of printing plates for a color print and screen ruling ratios between the threshold matrixes which are essentially equal to the screen ruling ratios between the printing plates for the color print, and the processed color image data are supplied to a color printer. The color printer outputs a color proof having a rosette pattern similar to the rosette pattern in the color print based on the supplied color image data.
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