An image processing apparatus includes a storage and processing circuitry. The storage is configured to store a dither table in which a plurality of dither patterns are recorded, each of the dither patterns being formed with a halftone dot screen in which an output area ratio that is a proportion of void halftone dots per unit area corresponds to any one of gradation values of image data. The processing circuitry is configured to read a gradation value for each region in image data input for each toner color, decide a dither pattern to be applied to the read gradation value, read out the decided dither pattern from the dither table, and perform dither processing of applying the read dither pattern to the region in the image data.

An image processing apparatus includes an output image reading portion that reads an image of a physical document. The physical document includes a desired print image and a line image. The apparatus further includes a line image detecting portion that detects the line image at a predetermined position of the physical document using the image, a line image analyzing portion that determines a line width of the line image, a line-width correction value determining portion that compares the determined line width to a preliminarily set line-width threshold value and determines a line-width correction value based on the comparison, and a line-width correcting portion that performs line width correction on a to be formed line image based on the line-width correction value.

A liquid discharge apparatus includes discharge nozzles, a carriage, a conveyor, and a controller. The discharge nozzles discharge liquid. The carriage holds the discharge nozzles. The conveyor conveys the carriage. The controller controls drawing of an object to be drawn, using the discharge nozzles. The controller draws an outer edge portion of the object using one discharge nozzle of the discharge nozzles in an outer-edge-portion drawing process, and draws a portion inside the outer edge portion of the object using another discharge nozzle of the discharge nozzles in an internal drawing process, the one discharge nozzle and said another discharge nozzle being different in characteristic.

A white-plate graphic erosion process is performed on print data subjected to a RIP process in the following procedure. First, an erosion candidate region which is a candidate for a region in which a white-plate graphic is eroded is determined. Then, a region to be applied with an ink of a color other than white is determined. Then, an application target region is determined. Then, a region other than a region obtained by an erosion process out of the application target region is determined to be an erosion allowed region. Then, a region included in the colored region and the erosion allowed region out of the erosion candidate region is determined to be an erosion target region. Finally, the values of data of pixels included in the erosion target region among white-plate data are rewritten such that the amount of white ink applied to the pixels is reduced.

Techniques related to rendering scanned images are discussed. Such techniques may include selectively processing segments of a scanned input image based on a neutral edge tag signal such that segments are color suppressed and edge enhanced when the neutral edge tag signal is asserted and error diffusion processed when the neutral edge tag signal is not asserted.

An image processing apparatus includes an output image reading portion that reads an image of a physical document. The physical document includes a desired print image and a line image. The apparatus further includes a line image detecting portion that detects the line image at a predetermined position of the physical document using the image, a line image analyzing portion that determines a line width of the line image, a line-width correction value determining portion that compares the determined line width to a preliminarily set line-width threshold value and determines a line-width correction value based on the comparison, and a line-width correcting portion that performs line width correction on a to be formed line image based on the line-width correction value.

An image processing apparatus includes a target value calculation unit configured to calculate a target value to be output in a predetermined region in input image data based on pixel values of pixels included in the region, a distribution order determination unit configured to determine a distribution order of output values for distributing output values corresponding to the target value in the region based on a pixel value of each pixel included in the region and a threshold value in the threshold matrix corresponding to the pixel, and an output value determination unit configured to determine an output value of each pixel included in the region by allocating the target value to at least one pixel included in the region in the distribution order.

An image processing apparatus includes a target value calculation unit configured to calculate a target value to be output in a predetermined region in input image data based on pixel values of pixels included in the region, a distribution order determination unit configured to determine a distribution order of output values for distributing output values corresponding to the target value in the region based on a pixel value of each pixel included in the region and a threshold value in the threshold matrix corresponding to the pixel, and an output value determination unit configured to determine an output value of each pixel included in the region by allocating the target value to at least one pixel included in the region in the distribution order.