A printing apparatus includes a print execution section and a controller. The print execution section includes: a printing head having nozzles from which ink is discharged; a main-scan section configured to execute main-scan in which the printing head moves along a main-scan direction relative to a printing medium; and a sub-scan section configured to execute sub-scan in which the printing medium moves along a sub-scan direction relative to the printing head. The controller obtains object image data indicating an object image formed by pixels, generates pieces of partial printing data by processing the object image data in an order from a downstream side toward an upstream side in the sub-scan direction, and causes the print execution section to execute, a plurality of times, the sub-scan and partial printing in which ink is discharged from the printing head during the main-scan by use of the pieces of partial printing data.

An information processing apparatus includes a processor configured to, in a case where a first color material, a second color material, a third color material, and a fourth color material in which a difference between the first color material and the fourth color material in a color space is less than a threshold value, are capable of being used, output combinations of values of color materials reproducing a first color, which is used for expanding a color gamut of a secondary color of the first color material and the second color material, and a second color, which is used for expanding a color gamut of a secondary color of the first color material and the third color material.

A color adjustment system includes circuitry to register job data for requesting printing a document file in a memory, register color sample data associated with the job data in the memory, cause a printing apparatus to print out the document file corresponding to the job data as a first printed matter, cause a reading apparatus to read the first printed matter to acquire first read image data, and generate an input profile based on the first read image data and the color sample data.

A color adjustment system includes circuitry to register job data for requesting printing a document file in a memory, register color sample data associated with the job data in the memory, cause a printing apparatus to print out the document file corresponding to the job data as a first printed matter, cause a reading apparatus to read the first printed matter to acquire first read image data, and generate an input profile based on the first read image data and the color sample data.

An apparatus comprises a unit configured to generate gradation data corresponding to an achromatic color generated by combining two or more colors among a plurality of colors, for an excess amount of a total gradation value exceeding a predetermined value, the total gradation value being a sum of gradation values of the plurality of colors used for recording a pixel of interest, and generate gradation data corresponding to the plurality of colors, based on the generated gradation data corresponding to the achromatic color; and a unit configured to quantize the generated gradation data, and generate data to control recording of dots corresponding to the pixel of interest. The predetermined value is a gradation value indicating whether or not to record the dots in an overlapping manner, in case that the dots corresponding to the total gradation value are recorded.

An image forming apparatus includes a recording head that ejects inks of different colors on a recording medium to form an image based on image data, a storage device that stores a plurality of different dot patterns for flushing, and a control device that functions as: a controller that allows the recording head to make flushing; an image area detector that detects an image area in the image data; an overlapping dot counter that counts a number of overlapping dots for each of the plurality of dot patterns according to which flushing is to be made on the image area, the number of overlapping dots being a number of dots in the dot pattern of the ink ejected on the image area; and a dot pattern assignor that assigns, according to the number of overlapping dots, the respective dot patterns for use in flushing with the inks of different colors.

An information processing apparatus includes a processor configured to, in a case where a first color material, a second color material, a third color material, and a fourth color material in which a difference between the first color material and the fourth color material in a color space is less than a threshold value, are capable of being used, output combinations of values of color materials reproducing a first color, which is used for expanding a color gamut of a secondary color of the first color material and the second color material, and a second color, which is used for expanding a color gamut of a secondary color of the first color material and the third color material.

A redundantly printed security-enhanced document, printing method, and system for better ensuring that the meaning of the information imparted by variable indicia printed by redundant printing indicia on a document protected by a removable Scratch-Off Coating (SOC). By printing the variable indicia with multiple colors, redundancy and integrity of the intended indicia is achieved relative to the perception of human eye photoreceptor cones. The redundantly printed document, methods, and systems enhance the overall appearance of the redundantly printed document, and reduce possible consequences resulting from misprinted variable indicia.

A non-transitory computer-readable medium stores computer-readable instructions. The instructions instruct a computer to perform processes including an acquisition step, a determination step, and a display step. The acquisition step includes acquiring a specified color. The determination step includes determining whether a device-independent color based on the specified color is present within a first color gamut based on first print settings of a printer. The display step includes displaying, when it is determined that the device-independent color is not present within the first color gamut, second print settings of the printer. The second print settings are different from the first print settings and cause a distance between the device-independent color and a second color gamut that is based on the second print settings to be smaller than a distance between the device-independent color and the first color gamut.

A non-transitory computer-readable medium stores computer-readable instructions. The instructions instruct a computer to perform processes including an acquisition step, a determination step, and a display step. The acquisition step includes acquiring a specified color. The determination step includes determining whether a device-independent color based on the specified color is present within a first color gamut based on first print settings of a printer. The display step includes displaying, when it is determined that the device-independent color is not present within the first color gamut, second print settings of the printer. The second print settings are different from the first print settings and cause a distance between the device-independent color and a second color gamut that is based on the second print settings to be smaller than a distance between the device-independent color and the first color gamut.