| 摘要 |
PROBLEM TO BE SOLVED: To maintain gradation stability and the linearity of gradation which are the effects of a dither processing, to reduce the generation of pseudo contours and to guarantee aging stability in an image output system for image- outputting image data from an external device through a printing controller in the printer part of an image formation device. SOLUTION: In this image output system, a printer controller (printing controller) 419 is provided with a reference gradation conversion table to be a reference at the time of performing the gradation conversion of the image data inputted from a host computer (external device) 418 and a synthetic gradation conversion table generated by inputting a gradation conversion table for a printer from the printer part of a digital copying machine 101 and synthesizing it with the reference gradation conversion table. Further, by using the synthetic gradation conversion table, the gradation conversion of the image data inputted from the host computer 418 is performed. |
