1. An image processing apparatus comprising: a controller configured to: create text image data representing a text image, based on target image data representing a target image including text; determine an extended text area in the target image based on information related to a sharpness of the text included in the target image, the extended text area including a text area corresponding to pixels constituting text in the text image represented by the created text image data, and also including a surrounding area around the text area; and change a color of the extended text area to a color of a background of the target image to create background image data.