Fitzpatrick, Cella, Harper & Scinto
A color film reading apparatus providing high-gradation color signals
 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. 
Canon Kabushiki Kaisha
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Yoshinori Yasumichi Kenichi
Ikeda Suzuki Outa