| 摘要 |
PROBLEM TO BE SOLVED: To prepare a gradation conversion table having high reliability in all gradation. SOLUTION: This image forming device is constituted so that the first gradation conversion table obtained at a set-up time and the second gradation conversion table obtained at the executing time of a job are synthesized and an image forming condition is controlled. Besides it is provided with a first gradation extension means 11 extending the number of gradation of the first gradation conversion table, a second gradation extension means 12 extending the number of gradation of the second gradation conversion table and a synthesis means 13 synthesizing the first gradation conversion table extended by the extension means 11 and the second gradation conversion table extended by the extension means 12 so as to prepare the third gradation conversion table. |
