| 摘要 |
<p>A deviation test pattern includes a reference scale printed by one reference printing unit (21B) among a plurality of printing units (21Y, 21M, 21C, 21B) arranged to print overlaid images of yellow, magenta, cyan and black. The reference scale has a plurality of scale bars (RB) arranged in a main-scanning direction at a pitch of 30 dots. Particularly, the deviation test pattern further includes a difference scale printed adjacent to and in parallel to the reference scale by a printing unit other than the reference printing unit (21B). The difference scale has a plurality of scale bars (DB) arranged in the main-scanning direction at a pitch of 29 dots (or 31 dots). <IMAGE></p> |
