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Color-image-forming-method-and-apparatus-for-improved-image-color-reproducibility

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Color image forming method and apparatus for improved image color reproducibility

Details

Inventors: Nakatani, Munehiro; Sugawa, Hiroya; Kishi, Masamichi;
Assignee: Minolta Camera Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Braun; Fred L.
Assistant Examiner:
Attorney, Agent or Firm: Price, Gess & Ubell

An image forming apparatus for forming a color image in a plurality of colors including a plurality of image forming units which are different in image forming color from each other, a spatial frequency detector for detecting a spatial frequency relating to an image of a prescribed color for every portion of an image to be formed, and a control unit for controlling the image forming units to perform image formation by one of the image forming units in a portion belonging to that having a high spatial frequency within portions to be subjected to image formation in the prescribed color while performing image formation by overlapping a plurality of colors through at least two of the image forming units in a portion belonging to that having a low spatial frequency on the basis of a detection output from the spatial frequency detector. Method steps for improving image color reproducibility are also described.

DETAILED DESCRIPTION An object of the present invention is to improve the reproducibility of image colors in a color image forming apparatus.
Another object of the present invention is to perform proper image processing in response to features of pixel data of an original image in a color image forming apparatus.
Still another object of the present invention is to improve reproducibility of image colors in a method of forming a color image.
In order to attain the aforementioned objects, the inventive color image forming apparatus is adapted to form a color image in a plurality of colors in one aspect of the present invention and comprises a plurality of image forming means, spatial frequency detection means and control means.
The plurality of image forming means are different in image forming color from each other.
The spatial frequency detection means detects a spatial frequency relating to an image of a prescribed color for every portion of an image to be formed.
The control means performs image formation by one of the image forming means in the image portion belonging to that high spatial frequency within portions to be subjected to image formation in the prescribed color and by overlapping a plurality of colors through at least two of the image forming means in a portion belonging to that having a low spatial frequency on the basis of a detection output from the spatial frequency detection means.
In order to attain the aforementioned objects, the inventive color image forming apparatus comprises a plurality of image forming means, discrimination means and control means in another aspect of the present invention.
The plurality of image forming means are different in image forming color from each other.
The discrimination means discriminates a line image portion from other portions in an image to be formed.
The control means performs image formation by one of the image forming means in the line image portion and by overlapping a plurality of colors through at least two of the image forming means in other portions on the basis of a discrimination output from the discrimination means

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