| 摘要 |
In one embodiment, a first reference pattern is caused to be printed with transparent ink ejected from a first printhead. A second reference pattern is caused to be printed, with a first colorant ink ejected from a second printhead, to least partially overlap the first reference pattern. The overlapping causes the second reference pattern to be visually discernible where the first and second reference patterns overlap. A background pattern, overlapping and surrounding the first and second reference patterns, is caused to be printed with a second colorant ink less dark than the first colorant ink. The printing of the background pattern causes the first reference pattern to be visually discernible where the first and second reference patterns do not overlap. |
