Liquid discharge apparatus and liquid discharge method

A liquid discharge apparatus comprising:

• a conveyor to convey a recording medium in a conveyance direction;
• a liquid discharge unit to form an image on the recording medium conveyed to the liquid discharge unit by the conveyor;
• a reader to read the image formed on the recording medium by the liquid discharge unit;
• and
• a circuitry configured to:
• cause the liquid discharge unit to form a mark image on the recording medium, the mark image including a first mark image including:
• two or more vertical lines extending in the conveyance direction;
• and
• two or more horizontal lines extending in a width direction intersecting the conveyance direction, and
• each of the two or more vertical lines intersecting or contacting each of the two or more horizontal lines;
• cause the reader to read the mark image on the recording medium to obtain read information of the mark image;
• correct an image to be formed on the recording medium based on the read information;
• and
• cause the liquid discharge unit to form the image, corrected based on the read information, on the recording medium.