An image reading apparatus includes: a reader that reads an image formed on a print medium; and a backing part that is disposed at a position facing the reader and is capable of switching a color of a portion to be a background of the print medium upon reading by the reader to a plurality of colors according to a type of the print medium and/or a color read from the print medium.

There is provided an inspection device that performs quality inspection of a printed matter, the inspection device including: a first hardware processor that obtains a document image; a first reader that reads the printed matter obtained by forming a printed image on one surface of a transparent material based on the document image from a side of the other surface opposite to the one surface; and a second hardware processor that detects an abnormality of the printed matter based on the document image and a read image by the first reader.

An image inspection device includes an image reader that reads a printed matter obtained by forming an image on a transparent support medium; a switcher that changes a reading condition by the image reader; a controller that performs reading in the image reader on a same printed matter for a plurality of times by changing the reading condition in the switcher; and a determiner that inspects the printed matter on a basis of data read by the image reader for the plurality of times.

An image reading apparatus includes: a reader that reads an image formed on a print medium; and a backing part that is disposed at a position facing the reader and is capable of switching a color of a portion to be a background of the print medium upon reading by the reader to a plurality of colors according to a type of the print medium and/or a color read from the print medium.

An image forming apparatus has a sheet reading portion, an assimilation surveying portion, a color changing portion, and a printing portion. The sheet reading portion reads image data from a transparent sheet tinted with a predetermined color owned by a user. The assimilation surveying portion looks for, out of printable colors, a particular color that assimilates to the color of the read image data. The color changing portion changes, out of the data of a predetermined document accepted from the user, the color of the data of a concealable character, which is a character concealed when overlaid with the transparent sheet, to the found particular color. The printing portion prints, out of the data of the document, the data of the concealable character in the particular color.