An image forming apparatus including a plurality of sheet feeding cassettes includes a control unit. The control unit performs control. In a case where a predetermined condition is satisfied during execution of a print job to print image data, the control unit performs control to execute interruption processing of a correction job to print a correction patch. The control unit performs control to determine, from the plurality of sheet feeding cassettes, a sheet feeding cassette to be used for the correction job based on information on the sheet feeding cassette used for the print job.

A system and method provide for automated evaluation of reference point pairs. For each of a set of reference point pairs in an input color space, a straight line connecting the reference points is sampled to generate a set of sampled points. Each of the set of sampled points in the input color space is converted to a sampled point in an output color space. For each of a set of color separations in the output color space, discontinuities are identified, based on the set of sampled points in the output color space. Candidate reference point pairs are identified in the set of reference point pairs for which at least one discontinuity is identified. The candidate reference point pairs can be validated by printing test sweeps, which are each derived from a respective set of sampled points in the output color space, and identifying contour artifacts in the printed test sweeps.

A liquid discharge apparatus includes circuitry and a memory. The circuitry generates density correction data corresponding to a reference printing condition, based on reference measurement data on a measurement result of a patch pattern printed under the reference printing condition, to control an image density. The memory stores difference data on a difference between measurement data of one or more printing conditions different from the reference printing condition and the reference measurement data. The circuitry generates density correction data corresponding to the one or more printing conditions different from the reference printing condition, based on the reference measurement data and the difference data stored in the memory.

In some examples, a device includes a printing device to generate an image on a substrate from a digital image, and a processor to: receive a scanned image of the image on the substrate, identify a plurality of image portions of the scanned image, identify horizontal color changes across a horizontal portion of the plurality of image portions, identify vertical color changes across a vertical portion of the plurality of image portions, compare the horizontal color changes and vertical color changes to corresponding horizontal color changes and corresponding vertical color changes of the digital image, and measure a presence of color plane misregistration, and the color, direction and magnitude of misregistration based on the comparison.

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 information processing apparatus, accessible to a color expert who manages colors of an image to be printed in a plurality of printing devices and a plurality of operators each of whom is capable of operating at least the one printing device out of the plurality of printing device, registers a patch image to be printed by any of the plurality of printing devices and/or a color management setting information piece defining a condition for printing by the printing device in accordance with an instruction provided by the color expert, sets the patch image and/or the color management setting information piece accessible to the one or more operators, and in response to a request from any of the plurality of operators, permits access to the patch image and/or the color management setting information piece set accessible to the operator who has made the request.

A determination is made on whether or not a recording medium is held in a state where calibration is executable, and the execution is pending in a case where the recording medium is not held. When the execution is pending, the determination is made again after a predetermined period elapses, and the calibration is executed in a case where the recording medium is held.

An image forming apparatus includes: an image forming unit configured to form an image onto a sheet; a conveyance roller configured to convey the sheet through a conveyance path, the conveyance path including a curved path being bent; a sensor configured to read the image formed on the sheet conveyed through the conveyance path by the conveyance roller, the sensor being configured to read the image formed on the sheet when a part of the sheet is conveyed through the curved path; and a controller configured to obtain information related to a type of the sheet, and to control, based on the information, a conveying speed of the sheet conveyed by the conveyance roller when the sensor reads the image.

An image processing apparatus that performs a color matching process according to a color reproduction characteristic of an objective device, the image processing apparatus including: a printing unit configured to perform printing; a reading unit configured to be capable of reading a first color characteristic chart, which is printed by the objective device, and a second color characteristic chart, which is printed by the printing unit; and a processing unit configured to perform the color matching process, based on first scanned image data, which is obtained by reading the first color characteristic chart by use of the reading unit, and second scanned image data, which is obtained by reading the second color characteristic chart by use of the reading unit.

A computer-implemented method is provided for dosing ink in a digital printing device with multiple ink channels, when printing on a reflective substrate. A digital printing system configured with the method is also provided. Target color data of a target color to be printed on the reflective substrate is captured, including both color data and spectral reflectance data. The captured color data is processed with a printer model to output a preliminary dosing ratio for each ink channel. A digital opacity value for the target color is computed from the dosing ratio of each ink channel. A natural opacity value for the for the target color is computed from the captured spectral reflectance data, and a difference between the digital and natural opacity values is calculated. A predicted dosing ratio for each ink channel is obtained by interpolating the difference against an ink step of a diffuse ink component of the target color.