An object is to enable highly accurate density unevenness correction while suppressing a reduction in productivity of printing accompanying correction value calculation for density unevenness correction. In the image processing apparatus, density correction information that specifies an output tone value for implementing a target density for an input tone value for each nozzle and which does not include the influence by a non-ejectable nozzle that cannot eject ink normally is acquired. In a case where a non-ejectable nozzle is detected during printing processing, output tone values corresponding to the detected non-ejectable nozzle and peripheral nozzles thereof among output tone values specified in the density correction information are changed.

A liquid discharge method of discharging a liquid from a nozzle of a liquid discharge head by applying a drive pulse to a drive element of the liquid discharge head includes an acquisition step of acquiring a recording condition, and a driving step of applying the drive pulse to the drive element. The drive pulse includes a first potential, a second potential different from the first potential, and a third potential different from the first potential and the second potential. The second potential is to be applied after the first potential, and the third potential is to be applied after the second potential. In the liquid discharge method, in the driving step, the drive pulse having the first potential that varies depending on the recording condition acquired in the acquisition step is applied to the drive element.

Examples include estimation of pen to paper spacing (PPS). Examples include an alignment pattern printed on a medium at a target speed, an optical scan procedure performed on the printed alignment pattern to determine values of cross-media misalignment for first and second portions of the alignment pattern, determination of a dynamic swath height error (DSHE) effect value based on the values of cross-media misalignment, and estimation of an amount of PPS based on the determined DSHE effect value and the target print speed.

A liquid ejecting device includes a liquid ejecting unit and a control unit configured to control ejection of liquid. A plurality of types of liquid include a first ink group that is capable of expressing a different color by mixing a plurality of color inks each other and a second ink capable of singly expressing a color of the same system as that of the different color. The control unit is capable of forming a first color mixture pattern and a second color mixture pattern that uses a greater amount of the first ink group than that of the first color mixture pattern to eject the first ink group, is capable of forming a monochrome pattern to eject the second ink, and forms a patch the second color mixture pattern that is adjacent to the first color mixture pattern and the monochrome pattern.

A method of controlling a printer is disclosed, the printer including a number of print heads extending across a print zone, and each print head including at least one nozzle array extending in a direction of a print head axis. Each nozzle array comprises a center section of nozzles and side sections of nozzles, wherein the side sections of neighboring nozzle arrays overlap defining an overlap region and the center sections of the nozzle arrays define non-overlap regions. The method includes: printing a test pattern using at least two nozzle arrays, the test pattern comprising an interferential-type pattern printed by the side sections of the nozzle arrays in the overlap region and a reference pattern printed by the center sections of the nozzle arrays in the non-overlap regions; detecting characteristics of the printed test pattern; comparing the characteristics of the printed test pattern in the overlap region and in the non-overlap region; and deriving information concerning the alignment of nozzle arrays from the comparison

An inkjet printing device includes a stage part including a stage, an inkjet head part including at least one inkjet head that disposes an ink on the stage, the ink including dipoles and a solvent having the dipoles, a heat treatment device that removes the solvent, a first sensing part that measures a position of the ink disposed on the stage, a second sensing part that measures a position of the inkjet head, and a third sensing part that measures a position of each of the dipoles disposed on the stage. A dipole aligning method includes disposing an ink on a substrate, the ink including dipoles and a solvent having the dipoles, generating an electric field on the substrate and disposing the dipoles on the substrate by the electric field, removing the solvent, and measuring a position of each of the dipoles disposed on the substrate.

An image forming apparatus includes a controller configured to, each time an unpaired first pattern element formed on a recording medium is conveyed over a particular distance in a conveyance direction in response to a conveyor rotating by a first amount, control an image former to form a second pattern element to be paired with the unpaired first pattern element thereby forming a first test pattern, and each time an unpaired third pattern element formed on the recording medium is conveyed over a specific distance in the conveyance direction in response to the conveyor rotating by a second amount, control the image former to form a fourth pattern element to be paired with the unpaired third pattern element thereby forming a second test pattern. At least one of the first and second amounts is a non-integer multiple of a rotation amount of the conveyor that makes a single rotation.

A driving waveform determining method with which a waveform of a driving pulse applied to a driving element provided in a liquid ejecting head that ejects a liquid is determined includes: a first step of determining a waveform candidate of the driving pulse; a second step of notifying a user of candidate information of the waveform candidate; a third step of receiving an instruction issued by the user in accordance with the candidate information; and a fourth step of determining the waveform of the driving pulse in accordance with the instruction.

An apparatus for dispensing droplet may include a droplet discharging member, a stage and a control member. The droplet discharging member may include a plurality of nozzles arranged in a first direction by a constant interval. The stage may receive a substrate including a plurality of regions for forming a plurality of pixels of a same size disposed in the first direction and a second direction substantially perpendicular to the first direction. The control member may control the droplet discharging member such that amounts of droplets may be substantially identical in the regions of the substrate for the pixels if the numbers of the nozzles of the droplet discharging member with respect to sides of the regions of the substrate for the pixels are different in the first direction. The control member may identify patterns of discharged droplets in the regions of the substrate for the pixels and adjusts the amounts of the droplets form the nozzles of the droplet discharging member by controlling operation of each of nozzles of the droplet discharging member.

A method for modifying color density values in a dot-based printing system uses a control unit. The control unit implements the modification of the color density values after a raster image has been created and modifies the number and/or size of print dots to be applied to a printing substrate in order to attain pre-defined color density target values.