Being the graduation adjustment system which does the graduation adjustment which responds to the light and shade of the foundation vis-a-vis the image formation device which generates the image

摘要

PPROBLEM TO BE SOLVED: To solve the problem, related to gradation adjustment of an image forming apparatus, that a variation occurs with the value of image data (reproduction border point) at which an image begins to appear on a highlight side if color or density of a paper differs. PSOLUTION: A print server 32 sends a reference image data to a printer 30. The printer 30 uses the image data to print a patch chart including a prescribed gradation pattern on a specific paper based on the reference gradation characteristics corresponding to a reference paper. The printed patch chart is read with a scanner 34, and the print server 32 detects a density Dsp2 at which an image appears on the specific paper based on the image data read from the patch chart. The reference gradation characteristics are generated for the specific paper which has a target density Dsp2 at a reproduction start point SP1 of the reference paper, and matches with the reference gradation characteristics of the reference paper on and after a prescribed joint point E. PCOPYRIGHT: (C)2005,JPO&NCIPI