Color image forming apparatus having function for correcting ima

Details Color image forming apparatus having function for correcting ima Color image forming apparatus having function for correcting ima

1996-10-15

2000-05-09

Vu, Kim Yen

Facsimile and static presentation processing

Static presentation processing

Attribute control

358519, 358521, H04N 160

Patent

active

060611448

ABSTRACT:
A color copying apparatus includes a function for correcting image density when an image development system is deteriorated after a relatively long time of usage. A reference image including a number of color gray scales is stored in a memory, and is recorded on a recording medium. Each color gray scale corresponds to each of a yellow, a magenta, a cyan, and a black color for a letter image and each of a yellow, a magenta, a cyan, and a black color for a halftone image. When the image development system is deteriorated, the reference image recorded on the recording medium represents image density which is different from the reference image stored in the memory. This difference is detected by comparing the image density of two reference images, one stored in the memory and the other recorded on the recording medium. In accordance with a result of the comparison, a suitable data table of gamma data for each color element for a letter image and for each color element for a halftone image is selected from among a number of data tables of gamma data stored in the memory, so that the image density is corrected for each color element and for each image type and such that the image development system of the color copying apparatus is set again in a condition in which an image can be reproduced in a superior quality.

REFERENCES:
patent: 5489996 (1996-02-01), Oku et al.
patent: 5589954 (1996-12-01), Watanabe
patent: 5594558 (1997-01-01), Usami et al.
patent: 5710871 (1998-01-01), Tadenuma et al.

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