| 摘要 |
A sensor produces an image signal indicative of the image of an original. The image signal is subjected to various types of processing by units ranging from an A/D converter 3 to a space filter 13. In an ordinary operating mode, the processing signal is subjected to a gamma conversion by a gamma conversion table set by a controller 21. If a gradation processing mode has been designated by the user, gradation processing is executed by a gradation processing conversion table set by the controller 21.
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