Image Processing Apparatus That Emphasizes Important Information Added to Margin Region and Image Forming Apparatus Including the Same

An image processing apparatus includes a data input unit, an operation panel, a storage unit, and a control unit. The operation panel accepts a registration of a margin image and a setting of an emphasis region within the margin image. The storage unit stores data for emphasis including a registered margin image and positional data. The registered margin image is the margin image that has been registered, and the positional data indicates a position of the emphasis region in the registered margin image. When the control unit determines that the registered margin image is included in the page image data, the control unit performs an emphasis process on an image of a corresponding region whose position at the registered margin image included in the page image data is identical to a position of the emphasis region in the registered margin image included in the stored data for emphasis.