The embodiments herein relate to a method performed by a system (100) for handling variations in a mark (110) printed by a group (105) of industrial printers (101). The system (100) obtains images of the printed mark (110) printed by each of the printers (101) in the group (105). The system (100) creates a composite image from the obtained images. The printed marks (110) appear as a repeating pattern in the composite image. The system (100) compares the printed marks (110) in the composite image to each other or to another mark. The system (100) detects variations with a first resolution in the printed marks (110) in the composite image as a result of the comparison. The system (100) creates an augmented image in which the detected variations are augmented to a second resolution. The first resolution is lower than the second resolution.

A chart creation method to be used in a system including an image forming apparatus and a control apparatus, the control apparatus and a non-transitory computer-readable medium storing a chart creation control program are provided. The chart creation method includes: creating a print image of a chart; giving instructions to the image forming apparatus to print the chart and measure colors of the chart; obtaining measured color values of the color patches of the chart from the image forming apparatus; and rearranging the color patches of the chart so as to restrict spread of average color values of subgroups of color patches in the chart within a predetermined range. The chart creation method further includes: creating a print image of the color chart including the rearranged color patches, and giving instructions to the image forming apparatus to print the chart and measure colors of the chart.

Example implementations relate to color compensation. Some examples may print a calibration target background on a non-opaque media. The calibration target background may have a color that increases a dynamic range of a set of color measurements of a calibration target foreground. Some examples may print the calibration target foreground over the calibration target background. Additionally, some examples may measure an optical density of the calibration target foreground with a reflective sensor and may calibrate a printer based on the measured optical density.

The embodiments herein relate to a method performed by a system (100) for handling variations in a mark (110) printed by a group (105) of industrial printers (101). The system (100) obtains images of the printed mark (110) printed by each of the printers (101) in the group (105). The system (100) creates a composite image from the obtained images. The printed marks (110) appear as a repeating pattern in the composite image. The system (100) compares the printed marks (110) in the composite image to each other or to another mark. The system (100) detects variations with a first resolution in the printed marks (110) in the composite image as a result of the comparison. The system (100) creates an augmented image in which the detected variations are augmented to a second resolution. The first resolution is lower than the second resolution.

Embodiments of the present disclosure provide an image calibration method, an image forming apparatus, and a storage medium. The method includes outputting a calibration image in response to a calibration instruction, where the calibration image includes a calibration pattern and a calibration mark; according to the calibration mark of the calibration image, determining whether a calibration event corresponding to the calibration image matches a calibration event corresponding to a current calibration operation, or determining whether a calibration event type corresponding to the calibration image matches a calibration event type corresponding to a current calibration operation; and performing image calibration according to the calibration pattern in the calibration image if the calibration event corresponding to the calibration image matches the calibration event corresponding to the current calibration operation, or if the calibration event type corresponding to the calibration image matches the calibration event type corresponding to the current calibration operation.

A chart includes a plurality of area images. Each area image of the plurality of area images includes a figure. The figure indicates positional information of each area image of the plurality of area images in the chart. An image forming apparatus includes an image forming device configured to form an image on a sheet to create the chart, and an image reading device configured to read the image in the chart.

An image forming apparatus includes: an image forming unit configured to form an image on a sheet; a conveyance unit configured to convey the sheet having the image formed thereon to a conveyance path; a reading unit configured to read a test image of a sheet conveyed to the conveyance path; and a controller configured to: determine an adjustment value for adjusting a geometric characteristic of an image to be formed by the image forming unit based on a reading result of the reading unit; control the image forming unit to form the test image; control the reading unit to read the sheet having the test image formed thereon; determine an adjustment value for adjusting a geometric characteristic of an image to be formed by the image forming unit based on a reading result of the reading unit.

An image forming apparatus includes a conversion unit configured to convert image data based on a conversion condition, an image forming unit configured to form an image on a sheet based on the converted image data, a detection unit configured to detect a pattern image on a transfer member, a reading unit configured to read a test image formed on a sheet, a controller configured to perform calibration based on a reading result of the reading unit, and a reception unit. In a case where the calibration is performed, the controller determines an image forming condition based on a result of detection by the detection unit before the test image is formed. In a case where the reception unit receives the discontinuation instruction, the controller changes the image forming condition to an image forming condition before the pattern image is formed.

A method for the automated generation of reference color values for color control purposes in a printing machine by using a computer includes, within a process of setting up the printing machine for a print job, initially carrying out printing operations and using a spectrophotometer to determine coloration values for every process color used in the print job. For every process color that is used in the print job, the computer automatically selects that coloration value of a process color that has the smallest deviation from a color set point that has been established at the beginning of the job and saves this coloration value as a new reference value for this process color.

An image forming apparatus includes: a raster image processing unit configured to convert original image data into image data for image formation being of a raster image; an image forming unit configured to form an image on a paper sheet; a reading unit configured to generate read image data by reading the image formed on the paper sheet; a monitor setting unit configured to set a monitor setting color and an ideal value for the monitor setting color; a color tone monitoring unit configured to monitor a color tone difference between a value of the read image data in the monitor setting color and the ideal value; and a hardware processor configured to perform control to have color correction performed in the image forming unit, wherein the monitor setting color includes at least one of a primary color, a secondary color, a tertiary color, and a tertiary achromatic color.