Patent ID: 7889404

Claim:
An image reading device comprising: a reading unit that reads an original document and outputs image data of the original document; and an image processing unit that processes the image data output from the reading unit, wherein the reading unit includes an optical unit that irradiates the original document with a light, and receives a reflected light from the original document, a converting unit that converts image data obtained from the reflected light into digital data, an adjusting unit that adjusts an output level of the digital data based on a correction coefficient for each color, and a color correction unit that performs a color-correction process of correcting a fluctuation of adjusted output level based on a color-correction parameter that differs from one image reading device to another, and the correction coefficient is generated before the reading unit is installed in the image reading device such that the output level becomes a predetermined value when the reading unit reads the original document without the color-correction process, and then adjusted without the color-correction process at a time when the reading unit is installed in the image reading device.