| 摘要 |
PROBLEM TO BE SOLVED: To reduce defects of image color information such as tone jumping phenomenon in image processing by correcting received image data through the use of a set correction condition and transferring the corrected image data to a host computer. SOLUTION: Image reading in a reflection original mode or image reading in a transparent original mode is selected on the basis of an instruction entered by user (S42). Finally a monitor on which a read image is outputted is selected (S43). A host computer calculates a gamma curve and a masking coefficient that are to be sent to a scanner from the host computer (S44). The scanner sets the gamma curve and the masking coefficient that are sent from the host computer to a gamma curve conversion processing circuit and a masking processing circuit (S45). The scanner starts image reading, transfers image data to the host computer (S46) and an application of the host computer receives the image data and outputs the data to the monitor (S47).
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