| 摘要 |
Variations of image density and gradation reproducibility upon image formation include short-term variations resulting from variations of apparatus environments, and long-term variations resulting from aging of the photosensitive bodies and toners. In order to standardize the density and gradation reproducibility of a copy image and print image, these variations must be corrected together. For this purpose, test print 1 is formed (S 101 ), a correction coefficient ka of the contrast potential for image formation is optimized based on density information obtained in step S 102 (S 103 ), and the grid potential and developing bias potential are set to obtain the contrast potential (S 104 ). Test print 2 is formed (S 105 ), the relationship between the laser output and density is calculated from density information obtained in step S 106 (S 107 ), and gamma conversion characteristics are set (S 108 ).
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