Colorimetric apparatus and colorimetric method

A colorimetric method for a colorimetric apparatus including:

• a support base configured to support, on a support surface, a colorimetric object on which a patch for color measurement and a detection target portion for detecting a position are formed;
• a colorimeter configured to measure a color of the patch;
• a carriage configured to support the colorimeter and movable in a first direction along the support surface and a second direction facing the support surface;
• a movement mechanism unit configured to move the carriage on the support base in a third direction extending along the support surface and intersecting the first direction;
• and
• an optical detection unit provided in the carriage and configured to project and receive light to thereby detect the detection target portion,
• the detection unit detecting, in a detection operation for detecting the detection target portion, the detection target portion based on a change in an output value of a light reception amount at a time when the carriage moving in the first direction or the third direction to straddle the detection target portion,
• the colorimetric method comprising:
• executing a retry operation for increasing a light projection amount and executing the detection operation again when the entire output value of the light reception amount of the detection unit at the time when the carriage straddles the detection target portion in the detection operation is smaller than a first threshold, reducing the light projection amount and executing the retry operation when the entire output value of the light reception amount of the detection unit at the time when the carriage straddles the detection target portion in the detection operation is larger than a second threshold, and grasping a position of the colorimetric object on the support surface based on a detection result in the retry operation when the retry operation is executed and measuring the color of the patch with the colorimeter.