| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of improving the reproducibility of intermediate gradation by switching a plurality of patterns. <P>SOLUTION: In an image forming device, when giving high priority on the reproducibility of a white thin line, in a range of a low gradation value, a gradation value with which the thickness of the white thin line in a dot screen corresponding to a gradation value is smaller than the minimum line width which is reproducible when focusing on the thickness of the white thin line in the image forming device, is made to be a threshold value, and when the gradation value of an input image exceeds the threshold value, the dot screen is switched to a line screen (S308). In a range of a high gradation value, a gradation value with which the thickness of the white thin line in the line screen corresponding to the gradation value is smaller than the minimum line width which is reproducible is made to be a threshold value, and when the gradation value of the input image exceeds the threshold value, the line screen is switched to a void dot screen (S312). <P>COPYRIGHT: (C)2012,JPO&INPIT |
