Image reading apparatus comprising a processor configured to extract an edge in an area corresponding to a holding member as an edge of an image corresponding to the document

An image reading apparatus comprising:

• a document positioning plate having a placement surface on which a document is to be placed;
• a stacking portion on which a document is stacked;
• a reading unit including a light-emitting diode configured to emit light and a reading sensor configured to receive light emitted from the light-emitting diode and reflected on the document, configured to read an image of the document placed on the document positioning plate via the document positioning plate or read an image of the document conveyed from the stacking portion;
• an operation unit configured to input information about a size of a holding member configured to hold the document;
• and
• at least one processor configured to:
• extract, in a case where the reading unit has performed reading in a reading mode in which the document held in the holding member is read, an edge in the read image of the document in an area corresponding to the holding member, the area being determined from the information about the size of the holding member input by the operation unit,
• wherein the holding member has a transparent portion and the document to be read is placed in the holding member so as to be visible via the transparent portion, and the holding member is placed on the placement surface with the transparent portion of the holding member in contact with the placement surface.