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Patent Searching and Data


Title:
IMAGE PROCESSOR AND COLOR CONVERSION TABLE GENERATING METHOD
Document Type and Number:
Japanese Patent JP2010283599
Kind Code:
A
Abstract:

To improve an image quality in a non-colored image, particularly an image of black or a color close to black used for letters, lines or the like, without adding special processing based on a method using a color conversion table which is established as a color conversion processing method for applying color conversion processing to an output color signal with respect to an input color signal composed of RGB, thereby improving quality of the entire image.

An image processor converts an input color signal to an output color signal adapted for an output device, using a composite color conversion table of color conversion tables for combining (black adjustment) use and for normal use (dependent on the output device). The image processor includes, as a means for generating a color conversion table for combining use, a means for changing, among output RGB values of the table prepared by non-conversion, an output RGB value corresponding to an input RGB value (a value close to black) which is determined to fall under a predetermined black adjustment target range to a further blackening value, so that the generated color conversion tables are combined and utilized to improve the image quality.


Inventors:
NAKAJIMA TAKEHIRO
Application Number:
JP2009000135272
Publication Date:
December 16, 2010
Filing Date:
June 04, 2009
Export Citation:
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Assignee:
RICOH CO LTD
International Classes:
H04N1/46; B41J2/525; G06T1/00; H04N1/60
Domestic Patent References:
JP2005045420A2005-02-17
JP2009089247A2009-04-23
JPH03121669A1991-05-23
JP2007288573A2007-11-01
JP2006115279A2006-04-27
JP2004165765A2004-06-10
JP2005045420A2005-02-17
JP2009089247A2009-04-23
Attorney, Agent or Firm:
根本 恵司