| 摘要 |
An image reading apparatus for reading an original image photoelectrically includes: a light source; a holding device to hold an original having the original image in a predetermined read position, a light quantity control device to control quantity of read light incident on the original image, an image sensor having a row of line sensors with regard to three primary colors or more colors, each line sensor corresponding to each color and having a plurality of photoelectric transducing elements arranged in a direction, a scanning device to relatively move the original and an optical system to an auxiliary scanning direction perpendicular to the element arrangement direction and an adjusting device to adjust read conditions at the image sensor for each line sensor independently. The image reading apparatus according to the present invention is of a digital image reading apparatus by slit scanning and can perform efficiently the appropriate image reading that is adjusted to have a wide dynamic range and a good color balance in accordance with the original image and also output a reproduced image of high quality at constant high productivity by such as a digital photoprinter.
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