Image reading and forming apparatus with switchable background for image sensor and colorimeter

An image forming apparatus comprising:

• a conveyance path that conveys a print medium,
• an image former that is disposed at a first position in a middle of the conveyance path and forms an image on the print medium,
• a reader that is disposed at a second position downstream of the first position in the middle of the conveyance path in a conveyance direction and reads the image formed on the print medium by the image former the reader including:
• an image sensor, and
• a colorimeter;
• and
• a backing member that is disposed at a position facing the reader across the conveyance path and is configured to move such that a color of a portion of the backing member to be a background of the print medium upon reading by the reader is changeable to a plurality of colors according to a type of the print medium and/or a color read from the print medium;
• wherein
• the conveyance path is bent in the image forming apparatus in a vertical direction, and
• the image sensor and the colorimeter are positioned at different positions in the vertical direction with respect to the conveyance path and positioned to overlap each other at least partially in the vertical direction.