A control unit determines nozzles corresponding to the image to be printed and causes a recording head to eject ink from the nozzles. A correction processing unit performs a correction process corresponding to each of ink ejection malfunction positions in the image. The correction processing unit (a) prints a test pattern using the recording head, (b) determines the ink ejection malfunction positions on the basis of a scanned image of the test pattern, (c) determines a droplet hit position deviation amount of the ink at each of the ink ejection malfunction positions, and (d) determines a print sheet type of the print sheet, performs comparison between the droplet hit position deviation amount and a threshold value set for the print sheet type, and determines whether the correction process should be performed to the ink ejection malfunction position or not on the basis of a result of the comparison.

In an image forming apparatus, a correction processing unit prints a test pattern using a recording head, determines ink ejection malfunction positions on the basis of a scanned image of the test pattern, sets one of first and second correction modes for each of the ink ejection malfunction positions in accordance with a density of the ink ejection malfunction position on the basis of the scanned image, and performs the correction process for the ink ejection malfunction position in the set first or second correction mode. In the first correction mode, the correction process is performed for both a nozzle corresponding to the ink ejection malfunction position and an adjacent nozzle of the nozzle. In the second correction mode, the correction process is not performed for the nozzle corresponding to the ink ejection malfunction position but is performed for the adjacent nozzle.

To enable highly accurate density unevenness correction while suppressing a reduction in productivity in printing accompanying correction value calculation for density unevenness correction. Based on an image obtained by scanning a chart including patches having uniform density for each tone value, a density characteristic of each nozzle is acquired. A non-ejectable nozzle that cannot eject ink normally is detected by analyzing a pattern for detecting the non-ejectable nozzle in the image obtained by scanning the chart. At the time of acquiring the density characteristic, the density characteristic is acquired based on a density measured value of an area of the image, which corresponds to a nozzle that is not detected as the non-ejectable nozzle.

The inventive concept provides a substrate treating apparatus. The substrate treating apparatus includes a head unit configured to discharge an ink to a substrate; a supply unit configured to supply the ink to the head unit and including a reservoir having an inner space; and a pressure adjusting unit configured to adjust a pressure of the inner space, and wherein the pressure adjusting unit comprises: a first pressure adjusting unit; and a second pressure adjusting unit in which a size for changing a pressure of the inner space per unit time is greater than the first pressure adjusting unit.

A recording apparatus includes a liquid ejection unit that moves in a first direction relative to a medium and eject liquid, and a control unit that controls the liquid ejection unit. The liquid ejection unit includes a plurality of nozzles arranged in a direction different from the first direction and configured to eject the liquid, the control unit forms, by using a first nozzle of the nozzles, a first pattern with a first length in the first direction, the control unit forms, by using two or more nozzles different from the first nozzle, a second pattern including an image arrangement in which images are arranged so as to be displaced in a step-like manner in the first direction and a second direction different from the first direction, a region on the medium where the second pattern is formed has a second length in the first direction, and the first length is greater than the second length.

A system is disclosed. The system includes at least one physical memory device to store compensation logic and one or more processors coupled with the at least one physical memory device to execute the compensation logic to generate first ink deposition function representing a first output ink amount versus input digital count for each of a plurality of color planes, generate second ink deposition function representing a second output ink amount versus input digital count for each of the plurality of color planes and generate transfer functions for each of the plurality of color planes based on the first ink deposition function and the second ink deposition function, wherein the transfer functions transform input digital counts.

There is provided image formation method for forming image on medium by discharging liquid from head having nozzles arranged in first direction and actuators corresponding respectively to the nozzles. The method includes: discharging the liquid onto the medium from the nozzles by applying first voltage to the actuators while performing relative displacement between the head and the medium in second direction intersecting the first direction; and applying second voltage higher than the first voltage to actuator, of the actuators, corresponding to correction nozzle, based on information identifying discharge defect nozzle being a nozzle, of the nozzles, unable to discharge the liquid normally, the correction nozzle being a nozzle, of the nozzles, adjacent to the discharge defect nozzle in the first direction.

A meniscus measuring method capable of quickly and accurately measuring meniscus positions in a plurality of nozzles of an inkjet head can be provided. The meniscus measuring method comprises providing a head unit capable of discharging ink through a plurality of nozzles, adhering ink remaining in the plurality of nozzles to a film to form a detection pattern on the film by bringing the film into close contact with the plurality of nozzles, measuring meniscus of ink remaining in the plurality of nozzles based on the detection pattern.

Provided are a nozzle inspection method and a nozzle inspection apparatus capable of accurately detecting a defect in an inkjet head nozzle within a short time. The nozzle inspection method comprises discharging a plurality of droplets into a first region of interest of a substrate using a first nozzle to form an inspection pattern, and determining whether the first nozzle is defective based on the inspection pattern.

In some examples, a system detects an error in an printing device, and selects a combination of a medium advance error correction process to address a medium advance error and a faulty nozzle correction process to address a faulty nozzle, where the selecting of the combination is from a plurality of different combinations of the medium advance error correction process and the faulty nozzle correction process, and the selecting is based on a criterion relating to an interaction between the medium advance error and faulty nozzle correction processes.