Color film reading apparatus providing high-gradation color sign

Details Color film reading apparatus providing high-gradation color sign Color film reading apparatus providing high-gradation color sign

1989-09-12

1990-05-01

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358461, 358475, G03F 308, H04N 140, H04N 146

Patent

active

049223356

ABSTRACT:
A color film reading apparatus capable of generating high-gradation color signals from either a color negative or positive film includes a holding device for holding a color negative film, illuminating apparatus for projecting illumination light onto the color negative film, a reading unit for reading image data from the light projected through the color negative film, and shading circuitry for performing shading correction. Control circuitry controls the reading unit to cause the reading unit to raed data from an unexposed portion of the negative to obtain shading correction data. In the case of a positive film, the controlling circuitry sets the shading correction data on the basis of data obtained from the illumination light. Further, a high-gradation color image may be obtained from either a film original or a reflection from an original document.

REFERENCES:
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patent: 4825065 (1989-04-01), Imai
patent: 4833532 (1989-05-01), Abe
patent: 4837450 (1989-06-01), Satomura et al.
Patent Abstracts of Japan, vol. 6, No. 254 (E-148) [1132], Dec. 14, 1982 (Kokai 57-152267).

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