1. A reading device comprising: a reader; a display; and a processor configured to: control the reader to read an image from an original sheet; specify characteristics of the read image by analyzing the read image; determine whether to perform an image process on the read image on a basis of the characteristics; perform the image process on the read image when it is determined to perform the image process on the read image on the basis of the characteristics; and output, to the display, both an output image and an explanation image representing contents of the image process performed on the read image when the image process is performed on the read image, the output image representing one of the read image and an image resulting from the image process performed on the read image.