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.

Provided is an image processing device used for image processing in an image forming device that executes linear image forming in a first direction repeatedly in a second direction orthogonal to the first direction and executes two-dimensional image forming on a recording medium, the image processing device including: a processor configured to: acquire a phase of a member that contributes to image forming by rotating or circulating in the second direction and calculate, for each of different phases, an input/output gradation characteristic indicating a correspondence relationship in density in the same pixels in pre-output image data and post-output image data acquired by scanning of an image formed on the recording medium; calculates correction data to solve a difference between the input/output gradation characteristic in each of the phases and a reference input/output gradation characteristic; and correct the pre-output image data with the correction data of each of the phases.

A method for reproducing an out-of-gamut spot color includes determining a color gamut for a color printer, and specifying a spot color by color coordinates in a three-dimensional color space. A first target color is determined corresponding to a color having a minimum color difference to the specified spot color, and a second target color is determined corresponding to a color on the color gamut surface having a hue value equal to a hue value of the specified spot color. A path is defined on the color gamut surface connecting the first target color and the second target color, wherein a control parameter is used to specify a relative position along the defined path. A control parameter prediction function is provided which computes a predicted control parameter value as a function of color coordinates. The predicted control parameter value is used to determine an aim color for reproducing the spot color.

A method for reproducing an out-of-gamut spot color includes determining a color gamut for a color printer, and specifying a spot color by color coordinates in a three-dimensional color space. A first target color is determined corresponding to a color having a minimum color difference to the specified spot color, and a second target color is determined corresponding to a color on the color gamut surface having a hue value equal to a hue value of the specified spot color. A path is defined on the color gamut surface connecting the first target color and the second target color, wherein a control parameter is used to specify a relative position along the defined path. A control parameter prediction function is provided which computes a predicted control parameter value as a function of color coordinates. The predicted control parameter value is used to determine an aim color for reproducing the spot color.

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 printing system includes: a scanner configured to scan a document to generate a document image; a determination section configured to automatically determine a first color in accordance with a situation; a specification section configured to cause a user to specify a color with recommendation of the first color; and a print section configured to perform two-color copying on a medium by using a color specified by the specification section.

A printing system includes: a scanner configured to scan a document to generate a document image; a determination section configured to automatically determine a first color in accordance with a situation; a specification section configured to cause a user to specify a color with recommendation of the first color; and a print section configured to perform two-color copying on a medium by using a color specified by the specification section.

An apparatus for processing an image, includes circuitry configured to: input a first image indicating a target color; input a second image formed by an image forming device to be subjected to adjustment; determine types of objects; and compare the first image and the second image and generate, for each of the types of the objects, a color conversion parameter, based on a correspondence between a chromaticity value in the first image and a chromaticity value in the second image.

An apparatus for processing an image, includes circuitry configured to: input a first image indicating a target color; input a second image formed by an image forming device to be subjected to adjustment; determine types of objects; and compare the first image and the second image and generate, for each of the types of the objects, a color conversion parameter, based on a correspondence between a chromaticity value in the first image and a chromaticity value in the second image.

Example implementations relate to adjust sharpness parameters. In some examples, a printing device can include a processing resource and a memory resource storing non-transitory machine-readable instructions to cause the processing resource to receive print data comprising color channels corresponding to print pixels to be formed on a multi-layer thermally activated print medium, determine a characteristic of a corresponding layer of the multi-layer thermally activated print medium for color channels of the received print data, adjust sharpness parameters of the color channels based on the determined characteristic of the corresponding layer of the multi-layer thermally activated print medium, and cause a print head of the printing device to apply thermal energy to an area of the multi-layer thermally activated print medium including the print pixels using the adjusted sharpness parameters.