| 摘要 |
An original scanning section has an illuminating source, and optically scans an original in the first direction to obtain a reflected light from the original. A designating section designates a desired range of the original as a designation area. Each of photosensors is arranged in the second direction perpendicular to the first direction so as to receive part of the reflected light and output a detection signal corresponding to a density of each portion of the original. A weighting operation section receives a designation output from the designating section, provides different weighting data for an inside area and an outside area of the designation area, receives each detection signal from the plurality of photosensors, operates each detection signal using the different weighting data, and outputs a density signal of the original. A control section receives the density signal from the weighting operation section and controls an illuminating amount of the illuminating source to be a correct value corresponding to the designation area and the density of each portion.
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