In some examples, a supply component for a printing device includes a memory device comprising a plurality of corrective data to produce a corresponding plurality of color tables each customized for a respective media type of a plurality of media types, wherein a respective corrective data of the plurality of corrective data corresponds to nodes of a reference color table for the printing device that is able to accept the plurality of media types for printing. The respective corrective data includes a plurality of residual values to transform the nodes of the reference color table to a customized color table for use with a selected media type of the plurality of media types.

An information processing apparatus, an information processing method, and a storage medium that execute density characteristics acquisition processing at an appropriate timing are provided.

Aspects of the disclosure provide for a method. In some examples, the method includes printing a target plot comprising a color ramp, scanning the target plot via a first image scanner to determine first scan results indicating a relationship between a scanned measurement determined by the first image scanner and lightness of a scanned portion of the target plot, scanning the target plot via a second image scanner to determine second scan results indicating a relationship between a scanned measurement determined by the second image scanner and lightness of the scanned portion of the target plot, and determining a lookup table indicating a difference determined based on the first scan results and the second scan results.

An information processing apparatus (10) for evaluating the chromatic discriminability of content includes: a unit (S12) that converts the color space values of each of first and second verification points A and B on the content into Lab color space values; a unit (S13) that calculates the color difference and the lightness difference between the first and second verification points based on the Lab color space values; and a unit (S23, S24) that determines color-difference discriminability by comparing the color difference between the first and second verification points with a color-difference threshold, and determines lightness-difference discriminability by comparing the lightness difference between the first and second verification points with a lightness-difference threshold. Each of the color-difference threshold and the lightness-difference threshold is set to a value that depends on whether a region containing the first verification point and a region containing the second verification point are adjoining or not.

A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

An information processing apparatus, an information processing method, and a storage medium that execute density characteristics acquisition processing at an appropriate timing are provided.

Color correction methods relate device dependent sensor responses (RGB) to device independent color values (XYZ). The present invention discloses a new approach to Hue Plane Preserving Color Correction (HPPCC) using weighted constrained 3×3 matrices. Accordingly, the methods of the present invention employ hue angle specific weighted matrixing. Given a device RGB from which a device hue angle is derived, a corresponding transformation matrix is found as the normalized weighted sum of all pre-calculated constrained white point and training color preserving matrices. Each weight is calculated as a power function of the minimum difference between the device and the training color hue angle. The weighting function provides local influence to the matrices that are in close hue angle proximity to the device color. The power of the function can be further optimized for global accuracy. The methods of the present invention are termed HPPCC-WCM for Hue Plane Preserving Color Correction Weighted Constrained Methods. Experiments performed using different input spectra demonstrate that the claimed methods consistently improve the stability and accuracy of state-of-the-art methods for color correction.

Color conversion attempt to reproduce an input CMYK combination on a print media using an output CMYK combination. In a 2-step process, ICC profiles are used for the color conversion. In some instances, a 1-step process may be used that avoids the use of the ICC profiles and provides a faster processing time. A color progression checker determines whether the 1-step process may be used for color conversions based on standard deviations of the colorants along paths within a three-dimensional look-up table for a destination ICC profile. If a certain number of standard deviations exceed 20%, then the 1-step process for color conversion may not be effective.

A color table is modulated. The color table includes a plurality of nodes, and each node corresponds with a color input in the first color space and provides a print output in a second color space. The set of the plurality of nodes are arranged in a vector of a first color perception parameter. The vector can be arranged according to an order of increasing second color perception parameter in the first color space to an end node of the set of the plurality of nodes. A node in the set of the plurality of nodes that provides a peak amount of the second color perception parameter on the medium is determined. The print output for the end node is replaced with a print output corresponding with the node that provides the peak amount of the second color perception parameter on the medium.