Abstract: A remaining amount detecting step is performed by a first controller, in which a remaining amount of a liquid contained is detected for each of a plurality of cartridges containing the liquid to be ejected from nozzles. An information transmitting step is performed by the first controller, in which when the remaining amount of the liquid in at least one of the cartridges is detected to be equal to or lower than a predetermined amount, information relating to a cartridge with a small remaining amount is transmitted, the cartridge with the small remaining amount corresponding to the at least one of the cartridges.

Abstract: A remaining amount detecting step is performed by a first controller, in which a remaining amount of a liquid contained is detected for each of a plurality of cartridges containing the liquid to be ejected from nozzles. An information transmitting step is performed by the first controller, in which when the remaining amount of the liquid in at least one of the cartridges is detected to be equal to or lower than a predetermined amount, information relating to a cartridge with a small remaining amount is transmitted, the cartridge with the small remaining amount corresponding to the at least one of the cartridges.

Abstract: A liquid ejection method includes: (A) moving nozzles relative to a medium, (B) ejecting liquid from the nozzles while the nozzles are moving relative to the medium, (C) forming a first pattern on the medium with the liquid ejected from the nozzles at either one of a timing delayed from a certain reference timing by a predetermined interval and a timing preceding the certain reference timing by a predetermined interval while the nozzles are moving in a certain direction with respect to the medium, and (D) when the first pattern has been formed on the medium with the liquid ejected from the nozzles at the timing delayed by the predetermined interval, forming a second pattern on the medium with the liquid ejected from the nozzles at a timing delayed from the certain reference timing by an interval equal to the predetermined interval while the nozzles are moving in a direction opposite to the certain direction with respect to the medium, and when the first pattern has been formed on the medium with the liquid ej

Abstract: An ink jet head includes (A) a first black nozzle column having a plurality of nozzles arranged at a predetermined pitch in a transportation direction of a medium and discharging black ink, (B) a second black nozzle column having a plurality of nozzles arranged at the predetermined pitch in the transportation direction and located at positions shifted from the plurality of nozzles of the first black nozzle column in the transportation direction and discharging the black ink, and (C) a color nozzle column having a plurality of nozzles arranged at the predetermined pitch in the transportation direction and located at the same positions as the plurality of nozzles of the second black nozzle column in the transportation direction and discharging different colors of ink from different groups of nozzles thereof, each group including a predetermined number of nozzles consecutively disposed in the transportation direction.

Abstract: A correction method of a transport amount includes: detecting a movement amount of a medium while transporting the medium using a transport roller, the transport roller being for transporting the medium by rotating, an actual movement amount of the medium, when the transport roller transports the medium by a predetermined transport amount, changing in accordance with a rotational position of the rotating transport roller; specifying the rotational position of the transport roller based on the detected movement amount, and transporting property information of the transport roller, which indicates a change in the actual movement amount according to the rotational position; and correcting the transport amount when the transport roller transports the medium after the rotational position has been specified, based on rotational position information, which indicates the specified rotational position.

Abstract: A correction method of a transport amount includes: obtaining transporting property information of a transport roller, which indicates a change in an actual movement amount of a medium according to a rotational position of the transport roller by detecting a movement amount of the medium while transporting the medium using the transport roller that is rotated, the transport roller being for transporting the medium by rotating, the actual movement amount of the medium, when the transport roller transports the medium by a predetermined transport amount, changing in accordance with the rotational position of the rotating transport roller; and correcting the transport amount when the transport roller further transports the medium after the transporting property information has been obtained, based on the obtained transporting property information.

Abstract: Density unevenness caused in an image formed with an overlap portion of nozzles is suppressed.