An ink-jet printer includes an ink-jet head. The ink-jet head has an image printing head and a ground-color-layer printing head. The image printing head is configured to print an image on a medium and has at least one image printing ink discharge port. The ground-color-layer printing head is configured to print a ground-color-layer on the medium and has at least one ground-color-layer printing ink discharge port. The medium and the ink-jet head are configured to relatively move parallel to a first line and along a second direction substantially perpendicular to the first line. A position of the ground-color-layer printing ink discharge port is displaced from a position of the at least one image printing ink discharge port along the first line and the second direction.