Image forming apparatus

Details Image forming apparatus Image forming apparatus

1990-07-17

1992-09-15

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 80, 358298, 346157, 346160, 355246, 355326, H04N 129, G03B 1501

Patent

active

051482894

ABSTRACT:
There is disclosed an image forming apparatus having a function for correcting the gradation characteristic of an image formed so as to be linear to the gradation degree.
The image forming apparatus has a correction circuit for correcting inputted graduatin data to gradation data having a number of gradation degrees larger than that of the inputted gradation data to represent gradation data of a document image more precisely, for example in a range of low gradation.
There is also disclosed a test mode for detecting an actual .gamma.-characteristic of the image forming apparatus by measuring toner densities of test images formed on a recording medium beforehand.

REFERENCES:
patent: 4675696 (1987-06-01), Suzuki
patent: 4839722 (1989-06-01), Barry
patent: 4894685 (1990-01-01), Shoji
patent: 4929978 (1990-05-01), Kanamori

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