The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 2010
Filed:
Sep. 18, 2003
Takashi Kimura, Kanagawa, JP;
Masakazu Yoshida, Kanagawa, JP;
Masanori Hirano, Kanagawa, JP;
Toshihito Kamei, Tokyo, JP;
Mikio Ohashi, Kanagawa, JP;
Taeko Takahashi, Kanagawa, JP;
Takashi Kimura, Kanagawa, JP;
Masakazu Yoshida, Kanagawa, JP;
Masanori Hirano, Kanagawa, JP;
Toshihito Kamei, Tokyo, JP;
Mikio Ohashi, Kanagawa, JP;
Taeko Takahashi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In an ink-jet printing device which has an ink-jet recording head in which a plurality of nozzles are formed, and forms an image based on multi-level image data, a gamma correction parameter is selected according to discharging characteristics of the recording head to an input gradation level or according to lightness characteristics of a printed image to an input gradation level, and an image is formed based on the selected gamma correction parameter. For example, even when there is a variation in lightness characteristics of recording heads as in FIG., an optimal gamma correction parameter is selected for each recording head and the image is formed. Thus, a constant image quality is obtained even if the recording heads are exchanged.