An ink supply structure includes at least one ink cartridge, at least one dye ink chamber, and at least one pigment ink chamber. The at least one dye ink chamber is contained in the at least one ink cartridge for storing a dye ink. The at least one pigment ink chamber is contained in the at least one ink cartridge for storing a pigment ink. One of the dye ink within the dye ink chamber and the pigment ink within the pigment ink chamber is selectively supplied from the at least one ink cartridge.