Print data is organized over rows and columns. The columns of each row are selectively assigned to calibration tables respectively corresponding to printheads of a pagewide array in accordance with a substrate advancement skew relative to the pagewide array. The calibration tables are applied to the columns of each row respectively assigned to the calibration tables. The columns of each row to which the calibration tables have been applied are printed using the printheads respectively corresponding to the calibration tables.

A printing apparatus comprising a printing head including a plurality of nozzles, a correction value setting unit configured to set a correction value, a printing data generation unit configured to correct image data and a printing control unit configured to cause to print a first region and a second region on, based on the image data after correction, wherein the printing control unit causes to print one of the first raster lines with a predetermined number of the nozzles and to print one second raster line with a number, greater than the predetermined number, of the nozzles, and the correction value setting unit sets the correction value applied to the second raster line and the correction value applied to some of the first raster lines, in accordance with a printing condition that changes a concentration difference of the second raster line from the first raster lines.

A liquid ejection apparatus is provided that includes a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object being conveyed; a detection unit that is provided with respect to each liquid ejection head unit of the plurality of liquid ejection head units and is configured to output a detection result indicating at least one of a position, a moving speed, and an amount of movement of the conveyed object with respect to a conveying direction of the conveyed object; and a control unit configured to control each liquid ejection head unit among the plurality of liquid ejection head units to eject liquid at a timing based on a plurality of the detection results of a plurality of the detection units.

A liquid discharge apparatus includes a liquid discharge device and circuitry. The liquid discharge device includes a plurality of rows of nozzles. The circuitry determines a timing at which the plurality of nozzles discharge the liquid based on a density of a plurality of patch images. Each of the plurality of patch images includes a reference dot and an adjustment dot. The reference dot and the adjustment dot are formed by the liquid discharged from the plurality of nozzles in a first row and in a second row, respectively, of the plurality of rows of nozzles. The reference dot corresponds to a prescribed base pixel. The adjustment dot corresponds to an adjustment pixel adjacent to the base pixel in the width direction. The adjustment pixel is shifted from the base pixel in the conveyance direction by a number of pixels that differs for each of the plurality of patch images.

Dot data for a boundary zone between metallic ink and color ink is changed to increase a time difference between a scan for applying the metallic ink and a scan for applying the color ink. With this change, a fusion time of the metallic ink is ensured, and the occurrence of an image defect is suppressed.

A printing system is provided comprising a print head including a plurality of ink nozzles; an actuator configured to move the print head relative to a substrate; a print head position sensing system configured to detect an actual position of the print head relative to the substrate; and a controller. The controller is configured to: receive the actual position of the print head detected by the print head position sensing system corresponding to a target print head position; determine a positional offset between the actual position and the target print head position; generate a nozzle firing pattern based on the positional offset; and control the print head to print the nozzle firing pattern at the target print head position using the plurality of ink nozzles.

A plurality of test patterns are printed with different print conditions, the test patterns each being formed by two inks out of a plurality of inks and a reaction liquid and including a plurality of patterns among which ejection positions of the reaction liquid relative to ejection positions of the two inks are displaced by a predetermined amount at a time. The optical properties of the respective test patterns printed on the print medium are detected. A displacement amount of the relative ejection positions of the reaction liquid from the ejection positions of the plurality of inks is obtained based on the optical property of the test pattern in which an optical density difference between the patterns in the test pattern is greater than a predetermined value and which has an optical density of a lowest level among the optical properties of the test patterns detected.

An inkjet image forming apparatus includes: an image former that forms an image on a transfer body by discharging an ink droplet from an inkjet head; and a hardware processor that detects a landing state of the ink droplet that has been discharged and landed on the transfer body and changes an image forming condition when the image is formed so that a detected landing state approaches a target landing state.

A printing apparatus includes a printhead having a plurality of chips, each including a plurality of nozzle arrays which are arranged in a predetermined nozzle array direction and each of which is formed from a plurality of nozzles and energy generation elements provided in correspondence with the nozzles of each nozzle array and each configured to generate energy used for discharging ink. The apparatus relatively moves the printhead and a print medium in a direction intersecting the nozzle array direction, reads a predetermined test pattern printed on the print medium by driving the printhead, analyzes the read test pattern, calculates a slant of the printhead with respect to a reference based on a result of the analysis, and corrects the calculated slant of the printhead by moving the printhead.

Embodiments of the disclosure provide for improved print position compensation, for example to improve accuracy of print job(s) performed by a printer. The print position compensation enables an offset of the time until printing occurs on a print media to account for changes and/or erroneous movement in a print media, such as due to slippage and/or other results of a force applied to the print media. Particular embodiments determine data values derived both for an output phase and a retraction phase of the printer's operation. Various embodiments generate a print position compensation based on sensor-based edge position distances determined during each of a media output phase and a media retraction phase. Alternatively or additionally various embodiments generate a print position compensation based on sensor-based media movement phase timestamp differentials determined during each of a media output phase and a media retraction phase.