Patent ID: 7571978

Claim:
A correction value determining method comprising: causing a head to record a first pattern for confirming a transport amount of a medium, while transporting the medium in a transport direction relative to the head in accordance with a target transport amount; obtaining a first correction value that is associated with a relative position of the head and the medium based on the first pattern, the first correction value being a correction value for correcting the target transport amount during transport of the medium; causing the head to record a second pattern for confirming the transport amount of the medium, by transporting the medium while correcting the target transport amount using the first correction value associated with the relative position; obtaining a second correction value that is associated with the relative position of the head and the medium based on the second pattern, the second correction value being a correction value for correcting the target transport amount during transport of the medium; and determining a correction value of the target transport amount by making a use of the first correction value and the second correction value associated with the relative position when the medium ceases to be secured by a roller provided on an upstream side of the head in the transport direction different from a use of the first correction value and the second correction value associated with the relative position at times other than when the medium ceases to be secured by the roller.