A method and system for printing 3D structures using 2D monochromatic images (for example, greyscale images) is provided. The method can include instructing a printing device to print a 2D monochromatic image using print material in a reservoir known to contain a structural print material to create a three-dimensional structure. The method can further include instructing the printing device to print a 2D color image using color print material in a reservoir known to contain color print material, thereby forming an inner or an outer color layer of the three-dimensional structure.

A liquid droplet ejecting apparatus comprises a liquid droplet ejecting head which has a nozzle array composed of a plurality of nozzles arranged in a first direction, a relative movement mechanism which relatively moves the liquid droplet ejecting head and a recording medium in the first direction, and a controller. The controller controls the liquid droplet ejecting head and the relative movement mechanism to record, on the recording medium, a nonuniformity correction pattern in order to correct any dispersion in a liquid droplet ejection amount among the plurality of nozzles. The controller is configured, in order to record the nonuniformity correction pattern, such that the liquid droplet ejecting head is allowed to eject liquid droplets from at least the first nozzle to thereby record a first pattern group, the relative movement mechanism is allowed to relatively move the liquid droplet ejecting head and the recording medium in the first direction by a predetermined distance, and the liquid droplet ejecting head is allowed to eject the liquid droplets from at least the second nozzle to thereby record a second pattern group.

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 generate a uniformity compensated halftone design for each of a plurality of pel forming elements, generate a missing neighbor corrected halftone design for each of the pel forming elements, generate a missing neighbor threshold lowering function for each of the pel forming elements based on the uniformity compensated halftone designs and the missing neighbor corrected halftone design and compute an average of the missing neighbor threshold lowering functions to generate an average missing neighbor threshold lowering function.

An apparatus prints images for a density adjustment on a plurality of sheets, reads the image on a sheet printed later among the plurality of printed sheets, determines a representative value by carrying out a calculation from at least a first density value read from an image at a predetermined position on a first sheet and a second density value read from an image at the predetermined position on a second sheet, which are printed later, and performs a print density adjustment using the determined representative density and a target density.

A color printing system includes a color management server and one or more printing devices. The color management server manages color printing resources among the printing devices. A test chart is printed at a printing device and used to capture calibration measurement data. Calibration settings are defined for the calibration measurement data. A tone reproduction curve (TRC) is generated based on the calibration measurement data and the calibration settings. The TRC is stored with the TRC settings and calibration measurement data to be used at a printing device. The TRC settings are edited and the TRC associated with the measurement data is updated or regenerated to reflect the edited settings. More than one TRC is updated with the new settings if it uses the measurement data.

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 generate a uniformity compensated halftone design for each of a plurality of pel forming elements, generate a missing neighbor corrected halftone design for each of the pel forming elements, generate a missing neighbor threshold lowering function for each of the pel forming elements based on the uniformity compensated halftone designs and the missing neighbor corrected halftone design and compute an average of the missing neighbor threshold lowering functions to generate an average missing neighbor threshold lowering function.

The present disclosure discloses a method and device (302) for adjusting grayscale of display panel, the method includes: performing image capture on the display panel, and obtaining a current image (S10); identifying an uneven area in the current image, and detecting original output brightness and original input grayscale of the uneven area (S20); determining a target input grayscale corresponding to a preset target brightness according to actual Gamma curve value which is obtained by testing the display panel (S30); using the difference between the original input grayscale and the target input grayscale as grayscale compensation value of the uneven area (S40).

The conversion of the dot percentages using the first conversion table Td1 and the second conversion table Td2 is performed for the gradation data Dh by the defective nozzle corrector 95. Here, the first conversion table Td1 converts the dot percentages of the pixels Px corresponding to the normal nozzles Nn having no discharge defect by the first rate Rd1 lower than 100%, and the second conversion table Td2 converts the dot percentages of the pixels Px corresponding to the surrounding nozzles Na located around the defective nozzle Nd by the second rate Rd2 higher than the first rate Rd1. Then, the shading correction is performed for the defect complemented gradation data Dc obtained by converting the dot percentages in this way by the shading corrector 96.

The present disclosure discloses a method and device (302) for adjusting grayscale of display panel, the method includes: performing image capture on the display panel, and obtaining a current image (S10); identifying an uneven area in the current image, and detecting original output brightness and original input grayscale of the uneven area (S20); determining a target input grayscale corresponding to a preset target brightness according to actual Gamma curve value which is obtained by testing the display panel (S30); using the difference between the original input grayscale and the target input grayscale as grayscale compensation value of the uneven area (S40).

A method of determining a condition of a printhead. The method includes the steps of: (i) printing a test image using the printhead, (ii) optically imaging the test image and determining optical densities along a length of the test image; (iii) converting the optical densities into a single-dimensional signal; (iv) analyzing one or more portions of the signal using a convolutional neural network to provide a classification for corresponding portions of the signal; and (v) using each classification to determine the condition of corresponding portions of the printhead.