A method for correcting in-track position errors in a digital printing system having a linear printhead includes printing a test target including a plurality of alignment marks. A data processing system is used to automatically analyze a captured image of the printed test target to determine a measured in-track position for each of the alignment marks. The measured in-track positions for the alignment marks are compared to reference positions to determine measured in-track position errors. An in-track position correction function is determined responsive to the measured in-track position errors, wherein the in-track position correction function specifies in-track position corrections to be applied as a function of cross-track position. A corrected digital image is determined by resampling an input digital image responsive to the in-track position correction function.

A method for correcting in-track position errors in a digital printing system having a linear printhead includes printing a test target including a plurality of alignment marks. A data processing system is used to automatically analyze a captured image of the printed test target to determine a measured in-track position for each of the alignment marks. The measured in-track positions for the alignment marks are compared to reference positions to determine measured in-track position errors. An in-track position correction function is determined responsive to the measured in-track position errors, wherein the in-track position correction function specifies in-track position corrections to be applied as a function of cross-track position. A corrected digital image is determined by resampling an input digital image responsive to the in-track position correction function.

A number of monochrome pages printed by a print system in a color mode and a total number of pages printed by the print system are monitored. A ratio of the number of monochrome pages printed by the print system in the color mode to the total number of pages printed by the print system is determined. The print system is switched between the color mode and a monochrome mode of the print system mode based on the ratio so as to reduce color cartridge wear of the print system and/or so as to reduce transitions between the color mode and the monochrome mode while printing monochrome pages.

A number of monochrome pages printed by a print system in a color mode and a total number of pages printed by the print system are monitored. A ratio of the number of monochrome pages printed by the print system in the color mode to the total number of pages printed by the print system is determined. The print system is switched between the color mode and a monochrome mode of the print system mode based on the ratio so as to reduce color cartridge wear of the print system and/or so as to reduce transitions between the color mode and the monochrome mode while printing monochrome pages.

An image processing apparatus is provided with a converter to convert a first color image into lightness information and color information other than the lightness information, a lightness compressor to generate compressed lightness information obtained by decimating a pixel value from the lightness information, a reconverter to combine the compressed lightness information and the color information to generate a second color image, an edge extractor to extract an edge included in the first color image, and a pixel value changer to change a pixel value at a position of the edge in the second color image while maintaining similar colors, to generate a third color image.

An image processing apparatus is provided with a converter to convert a first color image into lightness information and color information other than the lightness information, a lightness compressor to generate compressed lightness information obtained by decimating a pixel value from the lightness information, a reconverter to combine the compressed lightness information and the color information to generate a second color image, an edge extractor to extract an edge included in the first color image, and a pixel value changer to change a pixel value at a position of the edge in the second color image while maintaining similar colors, to generate a third color image.

When a first liquid containing the particles whose particle size average value is a first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that a circulation flow rate of the first liquid in the supply flow path, the nozzle flow path, and the discharge flow path is a first flow rate. When a second liquid containing the particles whose particle size average value is a second particle size larger than the first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that the circulation flow rate of the second liquid is a second flow rate lower than the first flow rate.

When a first liquid containing the particles whose particle size average value is a first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that a circulation flow rate of the first liquid in the supply flow path, the nozzle flow path, and the discharge flow path is a first flow rate. When a second liquid containing the particles whose particle size average value is a second particle size larger than the first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that the circulation flow rate of the second liquid is a second flow rate lower than the first flow rate.

Pixel blocks of a user-generated print job raster page are clustered into raster color clusters, and pixel blocks of a corresponding scanned page are clustered into scanned color clusters. For each raster color cluster, if a color difference between the cluster and a corresponding scanned color cluster is greater than a threshold, color fading of the cluster is determined from simulated depletion of each colorant of a printing device, and a likely depleted colorant is determined based on the corresponding scanned color cluster and the determined color fading. A most likely depleted colorant is determined from the likely depleted colorant predicted for each raster color cluster for which the determined color difference is greater than the threshold.

In an image processing device, a controller is configured to perform: selecting; generating; and outputting. The selecting selects a target partial image one by one from a plurality of partial images. The target partial image is represented by target partial image data. The generating generates partial print data for a partial print by executing an image process on the target partial image data. The partial print forms the target partial image while moving a print head in a printing direction. The partial print forms the target partial image while moving a print head in a printing direction. The image process includes a color conversion process. The color conversion process is executed on the target partial image data using one of a first profile and a second profile selected in accordance with the printing direction set for the partial print. The outputting outputs the partial print data to the printer.