Image reading apparatus, image reading method and original transport apparatus

摘要

An image reading apparatus includes a reading device for reading an original at a reading position; an image determining device for determining whether the original has a black and white image or color image; and an original length determining device for determining a length of the original in a transport direction. The original once read is returned to the reading position through a first circulating path or a second circulating path longer than the first circulating path by a selection device for selecting the first circulating path or the second circulating path according to a result of the determination by the original length determining device.