Image forming apparatus having a function that automatically adj

Details Image forming apparatus having a function that automatically adj Image forming apparatus having a function that automatically adj

1993-09-21

1995-10-24

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355246, G03G 1506

Patent

active

054614627

ABSTRACT:
According to an image forming apparatus and method of the present invention, an image of an original is read by an image reader unit, a correction of gradation reproduction or a pseudo gradation processing is provided to the read image data by an image processing section. When an image corresponding to the image-processed image data is printed out on a sheet material, a gradation chart for image forming conditions is outputted, a number of gradations corresponding to the image forming conditions, the image forming conditions corresponding to the number of gradations are detected, and a test pattern for gradation reproduction is outputted based on the detected image forming condition is outputted. The test pattern is read again by the image reader unit. Newly read gradation data and gradation data of the test pattern are compared with each other, and correction data for every gradation of the plurality of the gradation is calculated. The corrected data is calculated a predetermined number of times and stored, so that an average value is renewed.

REFERENCES:
patent: 4975745 (1990-12-01), Tanaka et al.
patent: 5124751 (1992-06-01), Fukui et al.
patent: 5196886 (1993-03-01), Nakane et al.
patent: 5198852 (1993-03-01), Mikami
patent: 5357317 (1994-10-01), Fukuchi et al.

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