Image forming apparatus which performs gamma correction on the b

Details Image forming apparatus which performs gamma correction on the b Image forming apparatus which performs gamma correction on the b

1989-09-27

1990-06-05

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 32, 358 75, 358164, 358453, 358458, G03F 308, H04N 138, H04N 140, H04N 146

Patent

active

049318640

ABSTRACT:
An image forming apparatus for forming an image of a partial area of an entire image frame includes an apparatus for designating a part of a frame and apparatus for selecting an image formation operation for the predetermined area designated by the designating means or an image formation operation for the entire area. The image data corresponding to the predetermined area is read out and a histogram, indicating intensity distribution, is produced corresponding thereto. A gamma conversion characteristic is determined based on a cumulative frequency distribution produced from the histogram. The image data read out is converted in accordance with the determined gamma conversion characteristic. An image is formed on the basis of the converted image data representing the predetermined part of the frame or the entire frame. In such a partial printing, the contrast or gamma characteristic of the partial image may be appropriately corrected by a correction of the gamma characteristic according to the selection of the partial area.

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