A printing apparatus has a sheet holding unit having a detection unit for detecting a size of a sheet which is held and a storage unit configured to store sheet information including at least a size of a sheet as information representing a sheet. The apparatus sets first sheet information selected by a user in association with the sheet holding unit from a plurality of items of sheet information stored in the storage unit and notifies the user of a mismatch in a case where a size of a sheet that the first sheet information set in the setting indicates, and a size of a sheet detected by the detection unit are mismatched.

An image forming apparatus includes: a sheet feeder; a reading device that takes a reading of a sheet fed from the sheet feeder; and a controller. The controller performs steps including: for each tray of the sheet feeder, managing sheet information including a reference reading value as a reference for the reading by the reading device; when switching from a first tray to another tray, selecting a second tray such that predetermined items of the sheet information match between the first and second trays; instructing the reading device to take a reading of a sheet fed from the second tray; calculating a correction value of a position of an image to be formed on the sheet fed from the second tray based on a quantity of change in the reading value relative to the reference reading value included in the sheet information of the second tray.

A conveying device includes a receptacle, an imager, and circuitry. The receptacle receives a medium. The imager captures an image of the medium. The circuitry acquires image information of the medium captured by the imager, and performs control based on at least one of a condition or a type of the medium. The at least one of the condition or the type is recognized based on the acquired image information.

An image forming apparatus includes a controller that executes a printing operation provided that a user permits, despite a recording sheet size indicated by size information (registered size) of a recording sheet placed on a manual bypass tray discording from a print size designated by a print job, and suspends the printing operation without permission from the user, when the recording sheet size indicated by size information (registered size) of the recording sheet stored in a long sheet feeding cassette discords from the print size designated by the print job.