| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for prevents dot reproduction in a highlighted part from failing due to engine variations of an image forming device. SOLUTION: An image forming device includes: a halftone-switching determining part (31) that determines information, specifying a halftone pattern, on the basis of the accumulated number of printed sheets or the installation environment conditions; a halftone selection part (33) for selecting a halftone, to be switched on the basis of the information for specifying a halftone pattern and a halftone pattern in use; and a halftoning part (34) for halftoning image data by using the selected halftone pattern. COPYRIGHT: (C)2011,JPO&INPIT
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