Ricoh Company, Ltd.

Ricoh Corporation

Katsuhisa Tsuji

Koji Hayashi

Takashi Bisaiji

Masaaki Kogure

Kazumi Kuwata

Tomoko Ogawa

When an ACC menu is called out on a liquid crystal screen of an operating section, the screen shown in FIG.,is displayed. When &ldquo;Execution&rdquo; of automatic color calibration for use of a copying function is selected, the screen in FIG.,is displayed. When it is desired to use the copying function, a gradation calibration table used when the copying function is changed with reference to the deference data. When Print Start key in FIG.,is selected, a plurality of density gradation patterns corresponding to colors of YMCK as well as to a plurality of image quality mode such as characters and pictures are formed on a transfer material. The density gradation patterns are previously stored and set in a ROM of an IPU. A write value for a pattern is changed according to a result of detection of the development characteristics.

Image forming apparatus

An image recording apparatus reproduces a halftone image with high resolution by using a systematic diether method and an error scattering method. Sharpness of an image to be reproduced is selectively variable.

Halftone image recording apparatus combining error scattering and

In processing a colored image in multilevel gradations, a color which does not affect the gradation of the image is processed in fewer multilevels and colors which affect the gradation are processed in an ordinary number of multilevels.

Method of processing colored image in multilevel gradations

A color image processing device including

Color image processing device

A digital image processing device for intermediate tone having threshold value tables provided with threshold values different from each other set for each of picture elements in a unit region containing a plurality of picture elements for gradation processing, in which inputted multi-value data are converted into binary data referring to said table and intermediate tone is expressed by adjusting the number of picture elements to be dotted and picture elements not to be dotted within the unit region of the gradation processing.

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Tokyo, Japan

Katsuhisa Tsuji