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:
Nov. 06, 1990
Filed:
Oct. 20, 1989
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A color film reading apparatus of this invention has holding means for holding a color negative film therein; illuminating means for projecting illumination light onto the color negative film; reading means for reading image data from the color negative film; shading correcting means for performing shading correction; and controlling means for controlling the reading means to cause the reading means to read data relative to an unexposed portion of the color negative film to thereby obtain shading correction data for the shading correcting means. The apparatus is capable of generating high-gradation color signals from either of color negative and positive films. This invention further provides an image forming apparatus capable of producing a high-gradation image from either of a film-type original document or a reflection-type original document.