1. A printing apparatus comprising: a head section which discharges a color ink which is cured due to irradiation of light and a clear ink which is cured due to the irradiation of light; an irradiation section which irradiates the light; and a storage section which stores a relationship between a total amount of color duty which is an amount of the color ink which is discharged per unit region and clear duty which is an amount of the clear ink which is discharged per unit region, and glossiness of an image which is printed using the color ink and the clear ink which have been discharged, wherein, according to the color duty in a certain region in the image, the clear duty in the region is determined based on the relationship so that the glossiness of the image is a predetermined value.