Colorimetry system and printing device for measuring colors in printed matter

A printing device comprising:

• a head having a nozzle configured to eject ink onto a print medium;
• a first carriage configured to support the head, the first carriage being movable in a first direction;
• a conveying unit configured to convey the print medium in a second direction crossing the first direction;
• a color measuring unit configured to measure a color of each of a plurality of patches included in a patch chart printed on the print medium;
• a second carriage configured to support the color measuring unit, the second carriage being movable in the first direction;
• and
• a controller,
• wherein the plurality of patches comprises:
• a first patch having a first color;
• and a second patch having a second color, and
• wherein the controller is configured to execute:
• a printing operation to print the patch chart on the print medium with ink ejected from the head;
• a determination operation for each of the plurality of patches, the determination operation for a target patch determining whether the target patch is the first patch or the second patch on a basis of patch information including information on the first patch and the second patch;
• and
• a color measuring operation for the plurality of patches, the color measuring operation comprising:
• a first color measuring operation to measure a color of the first patch with the color measuring unit while the second carriage moves in the first direction;
• and
• a second color measuring operation to measure a color of the second patch with the color measuring unit while the second carriage halts in the first direction,
• wherein when the controller determines in the determination operation that the target patch is the first patch, the controller executes the first color measuring operation for the target patch, and
• wherein when the controller determines in the determination operation that the target patch is the second patch, the controller executes the second color measuring operation for the target patch.