A processor identifies print defect locations where printing defects occur and a assigns different sensitivity values to different zones of a job image being prepared for printing by a printing engine. The processor changes the orientation of the job image to a revised orientation, relative to print media, to avoid locating one or more high-sensitivity zones of the job image in the print defect locations. The high-sensitivity zones are ones of the zones having a sensitivity value above a threshold sensitivity value. The printing engine prints the job image on the print media at the revised orientation.

A printing system is disclosed. The printing system includes at least one physical memory device to store calibration logic and one or more processors coupled with the at least one physical memory device to execute the calibration logic to perform uniformity compensation, including receiving print image measurement data corresponding to primary color markings and secondary color markings printed by pel forming elements, wherein each of the pel forming elements is associated with one of a plurality of primary colors, generating a first set of transfer functions based on the print image measurement data, wherein the first set of transfer functions includes a transfer function for each of the pel forming elements associated with a primary color, generating a second set of transfer functions based on the print image measurement data, wherein the second set of transfer functions includes transfer functions for each of the pel forming elements associated with a plurality of secondary colors, generating a set of inverse transfer functions for each of the pel forming elements based on the first set of transfer functions and the corresponding second set of transfer functions and generating a uniformity compensated halftone design based on the set of inverse transfer functions and a first halftone design.

In one example in accordance with the present disclosure, a method, system, and non-transitory machine-readable storage medium are described. A drop characteristic measurement of a drop of print fluid ejected from a printhead is detected. The drop characteristic measurement includes at least one of a drop velocity and a drop weight. The drop characteristic measurement is compared against a threshold value. When the drop characteristic measurement is beyond the threshold value, a remedial action is triggered.

An inkjet printing apparatus is configured to print the image in N (N is an integer of four or more) print scanning operations of a print head for a unit region of the print medium by using N mask patterns used in the N print scanning operations. The inkjet printing apparatus includes: an obtaining unit configured to obtain defective nozzle information specifying a defective nozzle; and a correction unit configured to divide the N mask patterns into mask groups each corresponding to two or more print scanning operations and correct the mask patterns based on the defective nozzle information in each of the divided mask groups.

A drop placement analyzer for an inkjet printer is described herein. The drop placement analyzer comprises a film support that has an opaque, optically non-interfering vacuum surface for immobilizing a film against the optically non-interfering vacuum surface and photographing drops disposed on the film from the same side of the film on which the drops are disposed.

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.

In image forming apparatus, a recording head is configured to eject ink corresponding to an image to be printed, using arranged nozzles. A control unit is configured to determine nozzles corresponding to the image to be printed, correspondingly to a position of a print sheet, and cause the recording head to eject ink from the nozzles. A correction processing unit is configured to perform a correction process corresponding to each of the plural ink ejection malfunction positions in the image. A head cleaning processing unit is configured to perform head cleaning for the recording head. Further, if the number of the detected ink ejection malfunction positions exceeds a predetermined upperlimit value when using a predetermined ink droplet size, the correction processing unit causes the head cleaning processing unit to perform head cleaning for the recording head and thereby decreases the number of the ink ejection malfunction positions.

A printing unit that prints an inspection image, a reading unit that reads the inspection image printed by the printing unit, and an analysis unit that performs analyzation based on a reading result read by the reading unit are provided. The inspection image includes an inspection pattern of a plurality of colors, the inspection pattern including a first position detection mark printed in a first color, a second position detection mark printed in the first color, and a second color inspection pattern printed in a second color different from the first color, the printing unit prints the second color inspection pattern at a position adjacent to the first position detection mark, and the analysis unit specifies a first position of the first position detection mark in a first region, and specifies a second position of the second position detection mark in a second region smaller than the first region.

An ejection device includes: an ejection unit provided with an ejection port configured to eject an ejection material; a piezoelectric element configured to cause the ejection material to be ejected from the ejection unit; a first liquid chamber connected to the ejection unit and configured to supply the ejection unit with the ejection material; a pressure control unit configured to control a pressure in the ejection unit by controlling a pressure in the first liquid chamber; and a detection unit configured to detect a wetness of an ejection port side surface.

The present disclosure is directed to a fluidic ejection device configured to detect whether one or more nozzles of the fluidic ejection device is in a normal state, a blocked nozzle state, or an accumulated fluid state. The fluidic ejection device includes an optical blockage detector having a light emitting device configured to emit a light signal, and a light sensor configured to detect the light signal. The optical blockage detector detects the normal state, the blocked nozzle state, and the accumulated fluid state based on the detected light signal.