An apparatus includes: a reading unit that obtains image data by reading a document through a reading glass; a detecting unit that detects a dirty place on the reading glass; a determining unit that determines a type of each area in the image data; an edge enhancing unit that applies an edge enhancement to each area based on the type determined; and a control unit that controls, when the type of an area determined is a text area, and when the area overlaps the dirty place detected, an amount of the edge enhancement for the area.