Patent ID: 8827403

Claim:
A printing apparatus comprising: a head unit that includes a plurality of head groups in a direction which crosses a transport direction, each of the head groups having a first head which ejects first ink to a medium transported in the transport direction, and a second head which is arranged in the transport direction together with the first head and which ejects second ink onto the medium, wherein an image is printed by forming dots using the first ink and dots using the second ink in bands, which are regions to which the ink is ejected, for each head group, wherein color difference, which indicates difference in color between patches formed for each band using dots each having same dot diameter from among a plurality of patches, is obtained based on a result of color measurement performed on a test pattern which includes the plurality of patches for each band, each of the plurality of patches being formed for each head group using dots having different dot diameters, and wherein an amount of the first ink and an amount of the second ink, which are respectively ejected from the first head and the second head which are included in all the head groups, are adjusted such that the dot diameter is determined based on the color difference.