An image processing apparatus acquires target image data generated by optically reading a sheet. The sheet includes an original image and an added image. The added image is added on the sheet. The apparatus specifies, from the target image, an added region surrounded by a surrounding line. The apparatus specifies a written target in the added region. The apparatus generates partially-erased image data and supplementary data by using the target image data and a result of the specifying of the written target. The partially-erased image data represents a partially-erased image that is based on the target image with an image inside the added region being erased. The supplementary data concerns the added image. The apparatus generates an image file including the partially-erased image data and the supplementary data so that the partially-erased image and supplementary information can be reproduced in selective one of a simultaneous manner and an independent manner.