Problem to be solved: to provide a reading operation according to user's usage.A reading means having a color line sensor andGenerating means for generating component data of one color which is monochrome image data by synthesizing a plurality of color component data of color image dataA color transmission mode for transmitting color image data which is a plurality of color component data andIt has an image data transmitting means having a monochrome transmission mode for transmitting monochromatic image data which is a component data of one color.The reading means is operated in the color reading mode.A first operation mode for operating said image data transmitting means in said monochrome transmission modeThe reading means is operated in the monochromatic reading mode.A second operation mode for operating said image data transmitting means in said monochrome transmission modeThe reading means is operated in the color reading mode.The third operation mode for operating the image data transmitting means in the color transmission mode is provided.Diagram
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