A decoloring apparatus includes a sheet conveying unit, a scanner, a decoloring unit, and a controller. The decoloring unit decolors the image on the sheet conveyed through the sheet conveying unit. The decoloring unit is positioned downstream of the scanner in a sheet conveying direction. A distance along the sheet conveying direction between the scanner and the decoloring unit is shorter than a length of a first predetermined sheet size and longer than a length of a second predetermined sheet size. A controller determines whether the sheet conveyed by the sheet conveying unit is the first predetermined sheet size or the second predetermined sheet size. The controller performs a mode limiting process if the sheet size is determined to be the first predetermined sheet size.

A printing apparatus includes a movement detector that detects a direction of movement of the printing apparatus relative to the printing medium, a printing unit that prints an image on the printing medium, and a processor. In a case where the movement of the printing apparatus in a first direction relative to the printing medium is detected by the movement detector, the processor causes the printing unit to print the image of a print subject on the printing medium; and after causing the printing unit to print the image of the print subject on the printing medium, in a case where the movement of the printing apparatus in a second direction differing from the first direction relative to the printing medium is detected by the movement detector, the processor executes a process indicating an occurrence of a printing error in printing of the image of the print subject on the printing medium by the printing unit.

A printing apparatus includes a movement detector that detects a direction of movement of the printing apparatus relative to the printing medium, a printing unit that prints an image on the printing medium, and a processor. In a case where the movement of the printing apparatus in a first direction relative to the printing medium is detected by the movement detector, the processor causes the printing unit to print the image of a print subject on the printing medium; and after causing the printing unit to print the image of the print subject on the printing medium, in a case where the movement of the printing apparatus in a second direction differing from the first direction relative to the printing medium is detected by the movement detector, the processor executes a process indicating an occurrence of a printing error in printing of the image of the print subject on the printing medium by the printing unit.