摘要:
A contact-type color scanning unit includes an RGB line sensor including a plurality of sensors corresponding to each of red, green, and blue colors. Sensors of different color are arranged along a sub scanning direction and sensors of same colors are arranged in a main scanning direction. A first switching unit performs first switching including switching between image data of any two colors and passing the remaining one color as is without switching thereby obtaining switched image data corresponding to each of red, green, and blue colors. A correcting unit performs line-to-line correction on the switched image data corresponding to each of red, green, and blue colors thereby producing corrected image data corresponding to each of red, green, and blue colors. A second switching unit that performs second switching including switching again the image data of the two colors that were switched in the first switching thereby producing switched-back image data corresponding to each of red, green, and blue colors that is in same order as an order alignment of the sensors in the sub scanning direction.