This invention provides an image processing apparatus for generating image data for recording in a recording apparatus including a recording unit including a plurality of nozzles discharging ink, comprising a converting unit which converts, based on characteristic information according to a characteristic of each nozzle included in the recording unit, image data corresponding to an input print job into image data to be used for recording by the recording unit; and a control unit which executes one of a plurality of correction processes based on image data obtained by reading an image recorded by the recording unit, wherein the plurality of correction processes include first correction processing that is performed after the recording of the image according to the print job is stopped, and second correction processing that is performed without stopping the recording of the image according to the print job.

An image forming apparatus includes a printer, a first reader, a second reader, and a processor. The printer is configured to print an image having diagnostic information on a sheet of paper. The first reader is configured to read a first image from the sheet of paper. The second reader is configured to read a second image from the sheet of paper. The processor is configured to cause a display to display a diagnosis result of a defect based on the first image and the second image.

In S200 after the first halftone, a scanning path is determined. In S205, a printing region to undergo multipass printing is fragmented. In S210, a printing time gap between the first printing time and the second printing time is calculated in the printing position. In S215, the position of the scanning path is associated with information on a color conversion table corresponding to the time gap. In the subsequent second color conversion, the color conversion table for use in color conversion is switched to the color conversion table corresponding to the time gap by using information on the pre-specified position of the scanning path and information on the color conversion table.

A semiconductor laser driver and an image forming apparatus incorporating the semiconductor laser driver. The semiconductor laser driver includes a light source including a plurality of laser-beam source units disposed in a sub-scanning direction that serves as a group direction, the laser-beam source units having a plurality of groups arranged in a main scanning direction, each of the laser-beam source units emitting a laser beam of a light quantity dependent upon a driving current, a shading corrector to correct, according to at least one shading correction value, the driving current given to the laser-beam source units for each of the groups, and a light quantity adjuster to adjust the driving current according to a light-quantity adjustment value for the laser-beam source units. The image forming apparatus includes a semiconductor laser drive circuit, and the semiconductor laser driver that serves as the semiconductor laser driver.

An image processing apparatus includes a processing unit that converts first input image data for a first region and second input image data for a second region to reduce a difference between first region recorded image density and second region recorded image density, and generates dot position data of a dot to be generated in each of the first and second regions based on the dot data after the conversion processing. The acquisition unit acquires edge information indicating a first object pixel edge of an image pixel for the first region and a second object pixel edge of an image pixel for the second region. Based on the acquired edge information, conversion and generation processing are performed in such a manner that a color signal of an edge pixel is increased/reduced to a degree lower than a degree to which a color signal of a non-edge object pixel is increased/reduced.

A grayscale adjustment method of a display panel, a grayscale adjustment device and a display device using the same are provided. The grayscale adjustment method includes steps of capturing an image of the display panel to obtain a current image; identifying a non-uniform block in the current image, and detecting an original output brightness value and an original input grayscale of the non-uniform block; determining a target input grayscale corresponding to a preset target brightness value according to an actual gamma curve value, wherein the actual gamma curve value is obtained by testing the display panel; and setting a difference between the original input grayscale and the target input grayscale as a grayscale compensation value of the non-uniform block.

An image processing method includes a first conversion step, a second conversion step that, using a second conversion table for converting input image data represented by a second color space to output image data represented by the second color space, converts image data of a second region for which recording conditions are different from a first region in a second image data, and a recording data generating step that generates recording data based on third image data including image data of a first region in the second image data and image data of the second region after conversion using the second conversion table. When adjusting an ink amount, the ink amount is not adjusted in the second conversion step and is adjusted in the first conversion step.

The present disclosure provides processing for performing highly-accurate density nonuniformity correction while saving the number of patches. A chart generation unit obtains measurement data of the latest test chart. A patch tone calculation unit obtains an output characteristic expressing measurement values for input tone values based on the obtained measurement data and calculates selected tone values to be used as the input tone values for a test chart from the obtained output characteristic. A chart image generation unit generates the test chart by using the calculated selected tone values as the input tone values and not using at least one initial tone value as the input tone value.

A printing system is disclosed. The printing system includes at least one physical memory device to store nozzle correction logic and one or more processors coupled with at least one physical memory device to execute the nozzle correction logic to receive a uniformity compensated transfer function for each of a plurality of pel forming elements, receive an average missing neighbor transfer function, receive a defective nozzles list including one or more of the plurality of pel forming elements indicated as defective during print production; and perform missing neighbor processing by applying the average missing neighbor transfer function associated with the pel forming element determined to be a neighbor of a defective pel forming element.

A method of printing, the method comprising: monitoring operation of first nozzles of a first nozzle array, and if malfunction of a number of first nozzles of the first nozzle array is detected, setting a number of second nozzles of a second nozzle array to a compensation mode. Monitoring operation of the number of second nozzles in the compensation mode and, in response to detecting that a printing parameter of the number of second nozzles differs from a reference printing parameter, adjusting an operation mode parameter of a subset of second nozzles.