In order to reduce a density difference that appears when printing whose execution number of scan operations is changed is performed, a CPU acquires a plurality of color conversion LUTs; the CPU performs printing of each of normal portions of color patches using a reference LUT and performs printing of each of hitch portions of the color patches using a corresponding one of mutually different color conversion LUTs; the CPU allows a color patch having a small density difference to be input as a selection result; the CPU identifies a color conversion LUT corresponding to the selection result; and the CPU designates the color conversion LUT corresponding to the selection result as a color conversion LUT for the hitch portion.

Calibration device for a diagnostic device, the diagnostic device comprising a digital imaging device arranged to record an image of at least one sample container containing at least one biological sample. According to the invention, methods include of digitally imaging said at least one sample container, thus obtaining a first image processing the first image, thus obtaining a second image printing a representation of the second image onto a substrate by means of a printing method, thus obtaining the calibration device, wherein said processing of the first image comprises applying at least one transfer function to the first image. The invention further relates to a corresponding calibration device, and a method of calibrating a diagnostic device by means of the calibration device.

When a job management program is executed by an arithmetic processing device in a terminal device, the arithmetic processing device operates as a job management unit for inputting a print job to an image forming apparatus. When a predetermined command is designated by a user operation, a job management unit inputs an image quality control print job for printing a specific color patch chart image on a target medium without applying color correction based on a color profile to the image forming apparatus for creating a color profile for the target medium desired by the user.

An image forming apparatus includes: an image forming section; an image reading sensor and a colorimeter; a temperature sensor; a memory that stores a first color value and a second color value in a first color chart that has a larger number of patches than a second color chart; a processor that creates a scanner profile for converting a first color value into a second color value using color values obtained by the image reading sensor and the colorimeter, corrects the scanner profile according to the color values obtained by the image reading sensor and the colorimeter, and converts the first color value into the second color value using the corrected scanner profile.

A color processing apparatus includes first, second, and third acquiring units. The first acquiring unit acquires first color data indicating association among first-space color in a first space, second-space color obtained using a reading unit reading measurement images having different first-space colors, and third-space color obtained by converting the second-space color through a predetermined transformation model. The second acquiring unit acquires second color data indicating association between the first-space color and the third-space color obtained using a measuring unit performing color measurement on some of the specific-color measurement images containing a specific color in the first space and included in the measurement images. The third acquiring unit acquires third color data indicating association between the first-space color and the third-space color obtained by converting the first-space color through a transformation equation obtained from the first and second color data. The conversion is performed on the other specific-color measurement images.

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.

A calibration system includes a photographing device, a first image forming apparatus, a second image forming apparatus, and a tone-characteristics correcting circuit. The first image forming apparatus prints a first chart including patches in a plurality of colors. The second image forming apparatus prints a second chart corresponding to the first chart. The tone-characteristics correcting circuit corrects tone characteristics of the first image forming apparatus. The tone-characteristics correcting circuit corrects the tone characteristics of the first image forming apparatus to tone characteristics of the second image forming apparatus based on a difference in color value of patches between the first chart and the second chart in a both-side print chart image generated such that the first chart and the second chart are simultaneously photographed by the photographing device.

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.

A system, device, and method for managing colors of a color printer by printing color patches on a test sheet of paper associated with a paper type, determining spectral data of the color patches using an inline full width array spectrophotometer of the color printer, determining measurements based on the spectral data, determining that a measurement is equal to or within a range of a measurement associated with an existing paper profile; and printing subsequent sheets of paper associated with the paper type using parameters associated with the existing paper profile.

The image forming apparatus includes a color conversion processing unit that has an input profile for color conversion to first image data which is image data of a device-independent color space, and an adjustment target profile for color conversion to second image data which represents gradation values of the plurality of color materials, and a simulation profile for color-converting the second image data to third image data of the device-independent color space, a profile adjustment unit that adjusts the adjustment target profile in accordance with the user input, determines whether or not a color difference before and after the adjustment of the adjustment target profile is smaller than a preset threshold value, and updates the adjustment target profile by using the adjustment target profile after the adjustment when the profile adjustment unit determines that the color difference is smaller than the threshold value, and a color difference calculation unit.