An information processing apparatus includes: a processor configured to execute a first smoothing process of smoothing a black component of a color conversion table, calculate other color components of the color conversion table using the black component for which the first smoothing process is executed, and execute a first update process of updating the color conversion table based on the black component for which the first smoothing process is executed and the calculated other color components.

An image processing apparatus comprises a unit configured to set a color selected by a user from among colors included in scanned image data obtained by reading a reference sample as a destination color for the adjustment-target color. Then, the unit configured to set a destination color has a function to set the destination color based on first scanned image data obtained by reading a color sample as the reference sample, in which patches of a plurality of colors including colors around the adjustment-target color are printed and a function to set the destination color based on second scanned image data obtained by reading a sample document.

A granularity check chart is printed and granularity is evaluated for each area representing a combination of a color value of blue and a color value of cyan and magenta. Thereafter, an unusable region regarding combinations of a color value of blue and a color value of cyan and magenta is determined on the basis of evaluation results. Then, corresponding relationships among a color value of cyan and magenta before spot color separation, a color value of blue after the spot color separation, and a color value of cyan and magenta after the spot color separation are determined so that each combination of a color value of blue and a color value of cyan and magenta after the spot color separation is not included in the unusable region, and a spot color separation LUT is created so that the corresponding relationships are satisfied.

An information processing apparatus includes a first acquisition unit to acquire a first color reproduction characteristic indicating first color reproduction color values that indicate a color obtained by reproducing color values by a first printing apparatus, a second acquisition unit to acquire a second color reproduction characteristic indicating second reproduction color values that indicate a color obtained by reproducing color values by a second printing apparatus, a first generation unit to generate color matching information when color matching is performed between the first and second printing apparatuses based on the first and the second color reproduction characteristics, a third acquisition unit to acquire a first line width characteristic of the first printing apparatus, a fourth acquisition unit to acquire a second line width characteristic of the second printing apparatus, and a second generation unit to generate line width correction for correcting an input line width for the second printing apparatus.

A method performed by a module executing on a computing device. The method includes receiving a request to generate a new color lookup table (C-LUT). The request includes at least one parameter value indicating a parameter change input by a user. The request may also indicate a number of data-points in the new C-LUT. The method includes generating a new color value for each of the data-points based on the at least one parameter value. The module appends the new color value for each of the data-points to a data structure and generates the new C-LUT from the data structure. The new color lookup table is operable to replace a current color lookup table.

An image processing apparatus includes an image forming device, a reading device, and circuitry. The image forming device is configured to form a first pattern on a recording medium. The first pattern includes a plurality of patches in a plurality of tones. The reading device is configured to read the first pattern. The circuitry is configured to acquire read data of the first pattern from the reading device. The read data includes red, green, and blue (RGB) color space values. The circuitry is further configured to: correct the read data based on information indicating a relationship between a color and a position in the first pattern to reduce variation in readings due to a read position of the first pattern; convert the read data corrected into device-independent data; and adjust a color reproduction characteristic of the image forming device based on the device-independent data.

Color mapping information can be used to transform one color to another color. The present embodiments provide a solution for representing the color mapping information using a successive application of multiple color mapping functions. Parameters for the multiple color mapping functions can be encoded into a bitstream. In one embodiment, color mapping functions are consecutively applied on their own domains of definition only. In another embodiment, the first color mapping (CRI1) is applied on its domain of definition only, but the second color mapping is applied only on samples that have been previously color mapped by CRI1 and which are also inside the domain of definition of the second color mapping function. At the decode side, the multiple color mapping functions can be reconstructed and successively applied to a decoded picture to generate another picture.

An image forming apparatus determines a correction value for correcting an output value of each of first spectral sensors, based on a measurement result of a first measurement image acquired by the first spectral sensors and a measurement result of the first measurement image acquired by a second spectral sensor while the second spectral sensor is being moved, corrects, using the determined correction value, an output value output from each of the plurality of first spectral sensors by measuring a second measurement image, and modifies an image forming condition based on the corrected output value.

A method for generating device-dependent color values which satisfy a colorant limit for an output device includes, for an input color defined by input values for three color channels in a first device-dependent color space, converting the input values to a hue angle , a saturation S, and value V in a second device-dependent color space. Minimum, maximum and middle ones of the input values are identified. The minimum is set to zero and the middle adjusted to maintain the input hue angle. A hue leaf relating output colorant mixture to input color can be constructed for the hue angle, and partitioned into regions. The region of the hue leaf containing the input color is identified and interpolated to identify intermediate values for the input color in a third device-dependent color space, such as CMYK. Output values in the third device-dependent color are the intermediate values or values derived therefrom.

An information processing device includes: an image acquirer that acquires an image to print onto a medium; a color converter that converts color in the image acquired by the image acquirer depending on a positional relationship between a white image forming section that forms an image on the medium with white color material and a color image forming section that forms an image on the medium with colored color material; and an image output unit that outputs the image whose color is converted by the color converter.