An image read controller for extracting an original portion from an image read by an image reader. The image read controller includes means for extracting a rectangular area containing the area in which the original exists from the read image, inclination detection means for detecting the inclination of the rectangular area, inclination correction means for correcting the inclination of the rectangle in response to the detected inclination, cut width setting means for setting the cut width of each side of the rectangle in response to the detected inclination, and cutting means for cutting the margins of the rectangular area based on the setup cut width of each side to extract the original image.