After dot image data is created via a halftone process, dot size determination is performed in step S110, it is determined there is a smaller dot in front motion in step S112, and, when the smaller dot is to be allocated to a front nozzle line, a moving process is performed thereon in step S116. Once moved by one dot, the dot position of a smaller dot is allocated to a rear nozzle line and thus discharged from the rear nozzle line that is less affected by an air flow.

The printing apparatus includes a printing head that includes a plurality of nozzles including a first nozzle, a discharging controller that is capable of controlling discharging of liquid from the plurality of nozzles, a transportation section that relatively moves a recording medium and the printing head by transporting at least either or both of the recording medium and the printing head, and a suction section that includes a suction port which is positioned at an upstream side or a downstream side of the printing head in a relative moving direction of the printing head and the recording medium. The discharging controller controls the first nozzle to discharge mist type ink droplets at a timing of not discharging ink droplets for forming image from the first nozzle, and the suction section suctions the mist type ink droplets discharged from the first nozzle through the suction port.

An inkjet apparatus includes a plurality of heads to discharge droplets from a plurality of nozzles of the plurality of heads to form an image on a medium, a head driver to generate a drive waveform to discharge the droplets from the plurality of nozzles of the plurality of heads, a scanner to read a specific pattern from the image on the medium formed by the droplets discharged from the plurality of nozzles of the plurality of heads, and a discharge amount adjuster to correct the drive waveform to reduce differences in discharge amount of the droplets between the plurality of heads according to the specific pattern read by the scanner.

A digital printing system includes a print head and a processor. The print head is configured to jet droplets of ink. The a processor is further configured to translate a required shade of a color, to be printed at a given location on a substrate by the print head, into a sequence of pulses, the sequence including: (a) up to a predefined maximum number of driving pulses that cause the print head to jet respective droplets, and (b) a tickling pulse, which has a smaller amplitude than the driving pulses and which causes the print head to jet a droplet smaller than the droplets jetted in response to the driving pulses. The processor is additionally configured to apply the sequence of pulses to the print head.

The printing apparatus is provided with a transport mechanism section that transports work, a printing mechanism section that has nozzles, which carry out printing by discharging an ink, as liquid droplets, onto the work transported by the transport mechanism section, and an adjustment section that adjusts a volume per single droplet of the ink discharged from the nozzles on the basis of a separation distance between the nozzles and the work, which is positioned directly below the nozzles.

A printing control device comprising: a receiving unit configured to receive an instruction to perform adjustment of the number of droplets to be ejected from ejection ports of an ejection head on a unit region of a printing medium, the ejection ports corresponding to an energy generation element, the energy generation element using electrical energy to generate energy for ejecting liquid; and a decision control unit configured to decide an amount of the electrical energy to be applied to the energy generation element corresponding to the ejection ports so that each of the ejection ports ejects the droplets; wherein the decision control unit decides whether to decide an amount of the energy in response to the receiving unit's receiving the instruction.

A printing device is provided with a print head having a plurality of nozzles configured to eject ink droplets therefrom, a supplier configured to supply ink contained in a container to the print head, and a controller. The controller is configured to perform obtaining ink information having correlation with a height of a liquid surface of the ink contained in the container, obtaining subject image data representing an image to be printed, generating print data based on the subject image data, and causing the print head to eject ink droplets based on the print data. The generating includes adjusting the print data in accordance with the ink information.

A liquid ejecting method includes ejecting droplets of an oil-based ink containing an oil-based medium onto a recording medium by using an ink jet head having a plurality of nozzles under the conditions satisfying relationships (1): fD4800; and relationship (2): 5Vd/30. In the relationships (1) and (2), D represents the nozzle pitch in dpi of the ink jet head, f represents the maximum ejection frequency in kHz, V represents the velocity in m/s of droplets ejected from the ink jet head, d represents the diameter in m of the droplets of the oil-based ink, represents the density in g/cm.sup.3 of the oil-based ink, and represents the viscosity in mPa.Math.s of the oil-based ink.

A supporting member includes a first supporting portion disposed on a first and second recording element substrate side, and a second supporting portion disposed on a side opposite to the first and second recording element substrate side with respect to the first supporting portion, the first supporting portion includes a first individual flow path for supplying liquid to a first recording element substrate, and a second individual flow path for supplying liquid to a second recording element substrate, and the second supporting portion includes a common flow path for supplying liquid to the first and second individual flow paths.

A liquid ejecting method includes ejecting droplets of an oil-based ink containing an oil-based medium onto a recording medium by using an ink jet head having a plurality of nozzles under the conditions satisfying relationships (1): fD4800; and relationship (2): 5Vd/30. In the relationships (1) and (2), D represents the nozzle pitch in dpi of the ink jet head, f represents the maximum ejection frequency in kHz, V represents the velocity in m/s of droplets ejected from the ink jet head, d represents the diameter in m of the droplets of the oil-based ink, represents the density in g/cm.sup.3 of the oil-based ink, and represents the viscosity in mPa.Math.s of the oil-based ink.