1. An image processing method comprising the steps of: extracting, from an image, a pupil region which corresponds to a pupil of a person and in which unsatisfactory color tone has arisen on the image; determining a target value of a characteristic amount of the pupil region in which unsatisfactory color tone has arisen, on the basis of a characteristic amount of a region including a majority of the image, a characteristic amount of a region in a vicinity of the pupil region in which unsatisfactory color tone has arisen, and a characteristic amount of the pupil region in which unsatisfactory color tone has arisen; and correcting a value of each pixel within the pupil region in which unsatisfactory color tone has arisen, such that the characteristic amount of the pupil region in which unsatisfactory color tone has arisen is substantially equal to the target value.