| 摘要 |
<P>PROBLEM TO BE SOLVED: To form an image at a suitable density coping with the change of an environment. <P>SOLUTION: A digital copying machine comprises a pattern image forming unit 53 which forms a pattern image including patches of a plurality of predetermined densities, a colorimetric data receiver 51 which measures the density of the pattern image by a colorimetric unit and receives an input of colorimetric data to be outputted, a gradation correction table generator 57 which generates a gradation correction table based on colorimetric data received by the colorimetric data receiver 51 and stores the gradation correction table, and a colorimetric data corrector 59 which measures the density of the pattern image by a colorimetric sensor after the gradation correction table is stored and corrects the colorimetric data to be outputted based on the colorimetric data which become the base for generating the stored gradation correction table. The gradation correction table generator 57 generates a new gradation correction table based on the corrected colorimetric data, and rewrites the stored gradation correction table. <P>COPYRIGHT: (C)2008,JPO&INPIT |
