Printing device setting expanded region and generating patch chart print data based on pixels in expanded region

A printing method for controlling a printing device including:

• a print head configured to perform printing based on image data on a printing medium, the image data representing an original image including a plurality of original pixels;
• a storage storing information on printing resolutions in which the print head can perform printing, the printing method comprising:
• displaying a preview image based on the image data, the preview image including a plurality of preview-image pixels, each preview-image pixel corresponding to one of the plurality of original pixels in the original image and having a color based on at least a color of the corresponding original pixel;
• receiving information on a preview-image pixel specified by a user among the plurality of preview-image pixels included in the preview image;
• setting an expanded region in the original image on a basis of a printing resolution in which printing based on the image data is to be performed among the printing resolutions stored in the storage, the expanded region including original pixels of the plurality of original pixels, the original pixels in the expanded region including an original pixel corresponding to the preview-image pixel specified;
• generating patch chart print data based on color values of at least two original pixels among the original pixels in the expanded region, the patch chart print data representing a patch chart image;
• and
• controlling the print head to print the patch chart image represented by the patch chart print data based on the color values of the at least two original pixels among the original pixels in the expanded region.

A non-transitory computer readable storage medium storing a set of program instructions for controlling a printing device including:

• a print head configured to perform printing based on image data on a printing medium, the image data representing an original image including a plurality of original pixels;
• a storage storing information on printing resolutions in which the print head can perform printing, the set of program instructions comprising:
• displaying a preview image based on the image data, the preview image including a plurality of preview-image pixels, each preview-image pixel corresponding to one of the plurality of original pixels in the original image and having a color based on at least a color of the corresponding original pixel;
• receiving information on a preview-image pixel specified by a user among the plurality of preview-image pixels included in the preview image;
• setting an expanded region in the original image on a basis of a printing resolution in which printing based on the image data is to be performed among the printing resolutions stored in the storage, the expanded region including original pixels of the plurality of original pixels, the original pixels in the expanded region including an original pixel corresponding to the preview-image pixel specified;
• generating patch chart print data based on color values of at least two original pixels among the original pixels in the expanded region, the patch chart print data representing a patch chart image;
• and
• controlling the print head to print the patch chart image represented by the patch chart print data based on the color values of the at least two original pixels among the original pixels in the expanded region.