Printing system, printing control method, information processing apparatus, and non-transitory computer-readable recording medium

A printing control method by a printing system including:

• a printing device including a thermal head that prints print content on a print medium;
• and an information processing apparatus that controls the printing device, the printing control method comprising:
• by the information processing apparatus,
• detecting, from print image data from a server, a position of a control target portion including a specific portion in a print image corresponding to the print image data, when a quality of the print medium is less than a determined level;
• generating printing control information for printing the control target portion;
• and
• transmitting the print image data, the position of the control target portion, and the printing control information to the printing device,
• wherein the detecting,
• binarizes each pixel of pixels of the print image,
• executes a morphology conversion process on each binarized pixel,
• extracts a contour from the pixels after the morphology conversion process,
• detects a position of the specific portion from the extracted contour, and
• detects the contour as the position of the specific portion when a duty ratio between one value and other value out of two values of each pixel of the extracted contour is equal to or more than a determined duty threshold, to detect the position of the control target portion including the specific portion;
• and
• by the printing device, executing different printing controls for the control target portion and a portion other than the control target portion based on the print image data, the position of the control target portion, and the printing control information.

An information processing apparatus that controls a printing device including a thermal head that prints print content on a print medium, the information processing apparatus comprising a processor configured to:

• executing a detecting to detect, from print image data from a server, a position of a control target portion including a specific portion in a print image corresponding to the print image data, when a quality of the print medium is less than a determined level;
• generate printing control information for printing the control target portion;
• and
• transmit the print image data, the position of the control target portion, and the printing control information to the printing device,
• wherein to detect the position of the control target portion, the processor is configured to,
• binarize each pixel of pixels of the print image,
• execute a morphology conversion process on each binarized pixel,
• extract a contour from the pixels after the morphology conversion process,
• detect a position of the specific portion from the extracted contour, and
• detect the contour as the position of the specific portion when a duty ratio between one value and other value out of two values of each pixel of the extracted contour is equal to or more than a determined duty threshold, to detect the position of the control target portion including the specific portion.