Split printing on a printing medium

A non-transitory computer readable medium storing an image data processing program,

• the image data processing program being executed by a computer connected to a printer including:
• a conveyer configured to convey a printing medium;
• and a printing unit configured to perform printing corresponding to input image data on the printing medium conveyed by the conveyer,
• wherein the image data processing program causes the computer to:
• obtain a width of the printing medium;
• obtain a piece of image data that is a printing target and that includes a first two-dimensional code generated by a first error correction level, and save the piece of image data in a memory of the computer;
• divide the piece of image data into a plurality of pieces of first divided image data corresponding to the width of the printing medium obtained;
• determine whether the first two-dimensional code included in the piece of image data is divided into a plurality of two-dimensional codes;
• in a case that it is determined that the first two-dimensional code is divided into the plurality of two-dimensional codes, increase an error correction level of the plurality of divided two-dimensional codes included in the plurality of pieces of first divided image data to a second error correction level higher than the first error correction level;
• and
• sequentially output the plurality of pieces of first divided image data to the printing apparatus.