A liquid discharge apparatus includes circuitry and a memory. The circuitry generates density correction data corresponding to a reference printing condition, based on reference measurement data on a measurement result of a patch pattern printed under the reference printing condition, to control an image density. The memory stores difference data on a difference between measurement data of one or more printing conditions different from the reference printing condition and the reference measurement data. The circuitry generates density correction data corresponding to the one or more printing conditions different from the reference printing condition, based on the reference measurement data and the difference data stored in the memory.

In at least one embodiment, a number of nozzle rows in a first area on a side of one end of a first substrate closest to one end of a print head is set to be lower than a number of nozzle rows on a central side of the print head relative to the first area, and energy for driving the element on the first substrate is set to be larger than energy for driving the element on a second substrate on the central side of the print head relative to the first substrate to set a dot to be formed on the recording medium by ink discharged from a nozzle in the first area to be larger than a dot to be formed on the recording medium by ink discharged from a nozzle in the second substrate.

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.

An example of a printing system is disclosed. The example disclosed herein comprises a plurality of nozzles and a controller. The plurality of nozzles is to eject a printing agent on a substrate to print a print job. The controller is to receive the print job comprising an outline and a fill area to be printed. The controller is also to define a first subset of the plurality of nozzles as a first printing mode to print the outline. The controller is further to define a second subset of the plurality of nozzles as a second printing mode to print the fill area, wherein the second subset comprises more nozzles than the first subset. The controller is further to print the print job based on the first printing mode and the second printing mode.

A processor measures a pulse interval for a plurality of rotational phases of a rotary encoder, respectively. Each time the pulse interval is measured, the processor accumulates a measured value, which is the pulse interval or a moving average of the pulse interval of time-series data in association with corresponding one of the plurality of rotational phases, and records the measured value in a storage device. The processor derives a plurality of reference values corresponding to the plurality of rotational phases. Each time the measured value is newly obtained, the processor derives a correction value of a time interval of ink ejection of the inkjet recording apparatus in accordance with a difference between the measured value that is newly obtained and a corresponding reference value. The corresponding reference value corresponds to one of the rotational phases which corresponds to the measured value that is newly obtained.

A printing system for printing images formed of pixels on a substrate, the system comprising a print system arranged where printheads traverse a substrate, the print system arranged to receive a sequence of print actuation requests in order to print each pixel of an image upon the substrate, the print system having an acceptable rate for the sequence of print actuation requests, the system configured whereby if presented with an actuation period of less than the minimum actuation period then the presented rate of print actuation requests is adjusted by altering the actuation event and/or the discarding of stripe data, to minimise print defects.

A liquid discharge apparatus includes a nozzle plate with nozzles and actuators and a drive controller. First and second nozzles are directly adjacent to each other in a first direction. First and third nozzles are directly adjacent to each other in a second direction. The drive controller is configured to apply a drive signal to first, second, and third actuators corresponding to the first, second, and third nozzles, respectively, during a drive cycle. A difference between a first timing at which the drive signal is applied to the first actuator and a second timing at which the drive signal is applied to the second actuator and a difference between the first timing and a third timing at which the drive signal is applied to the third actuator is an odd number multiple of a half of an inherent vibration cycle of the liquid discharge apparatus.

A printing apparatus according to an aspect includes a printing mechanism and a control section configured to control the printing mechanism to form a different margin according to presence or absence of an abnormality of the printing mechanism and a degree of the abnormality.

A memory circuit for a print component including a plurality of I/O pads, including an analog pad, to connect to a plurality of signals paths which communicate operating signals to the print component, and a memory component to store memory values associated with the print component. A control circuit to, in response to identifying a sequence of operating signals representing a memory read, provide a first analog signal on the analog pad in parallel with a second analog signal from the print component to provide an analog electrical value on the analog pad representing stored memory values selected by the memory read.