1. A printing apparatus comprising: a printing portion that prints a color chart in which a plurality of patches are arranged in a first direction and in a second direction different from the first direction; a color measurement portion that applies a spot of light to the color chart, and measures a color of each of the plurality of the patches using reflected light from the spot; a carriage on which the printing portion and the color measurement portion are mounted; and a relative movement portion that relatively moves the carriage with respect to the color chart, wherein a width Wp (m) in the first direction in each of the plurality of the patches is expressed using an expression as follows: 
 Wp=D +{( D·Tm/Tnl )·( W−D )} 1/2 here, D is a width (m) of the spot in the first direction, Tm is a time (seconds) for measuring the color of one of the plurality of patches by relatively moving the carriage in the first direction with respect to the color chart, Tnl is a time (seconds) for the carriage to relatively move a distance of one row in the second direction with respect to the plurality of patches, and W is a width (m) of the color chart in the first direction.