An image processing apparatus includes a processor configured to calculate color data for inspection by converting printing data that is data as a base of an image to be printed and includes a normal color which is a normally used color and a spot color which is a color other than the normal color, into color data of another color space in which the number of colors is decreased, for each of the printing data of the normal color and the printing data of the spot color and then, combining the color data after the conversion, and output the calculated color data for inspection.

An image processing method includes performing first halftone processing and second halftone processing. The second halftone processing is performed, for a second kind of color in advance among a plurality of colors constituting an original image, in units of blocks each consisting of a plurality of pixels that constitute the original image and the second kind of color is converted into an amount of second kind of ink corresponding to the second kind of color among the plurality of inks. The first halftone processing is performed, for the first kind of color, for each pixel that constitutes the original image or each pixel group having a smaller number of pixels than the block and the first kind of color is converted into an amount of first kind of ink corresponding to the first kind of color among the plurality of inks.

In an example implementation, a method of rosette-free printing includes, in a printing device whose color plane misregistration is less than 15 percent of a screen ruling of a halftone screen, printing multiple color planes of a multicolor image using the halftone screen.

An information processing device includes a processor configured to acquire image data including color information, acquire color information of a formed image, the formed image being an image formed on a recording medium on a basis of the image data, acquire light transmittance information expressing a degree of light transmittance of an image-carrying medium, the image-carrying medium being the recording medium on which the formed image is formed, and associate first color information, second color information, and the light transmittance information with each other, the first color information being the color information included in the image data and the second color information being the color information of the formed image.

An image forming apparatus outputs a tone chart for calibration by a printer, reads the output tone chart by a scanner, determines whether data on a sheet is affected by a surface shape of the sheet based on the read tone chart, corrects data on a white area of the read chart based on a result of the determination, and executes calibration using the corrected data.

The present document provides image processing methods and apparatus. One claim recites: obtaining a signal to be encoded in color image data, the signal comprising a plural-bit payload; predicting a resulting color of overprinting several inks on a substrate, the overprinting representing the color image data encoded with the signal; using the resulting color for both i) visibility evaluation of the overprinting, and ii) signal robustness evaluation of the overprinting as seen by an imaging device. Other claims and combinations are provided.

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 verification optimization program causes a computer to execute a process including steps of, when a plurality of color conversion patterns are extracted, determining whether one color conversion profile and another color conversion profile coincide with or approximate to each other by comparing color saturation values which are estimated with respect to color conversion profiles, determining whether one color correction table and another color correction table coincide with or approximate to each other by comparing color saturation values which are estimated with respect to color correction tables, and performing control to perform verification on one color conversion pattern in two or more color conversion patterns of which the color conversion profiles and the color correction tables both coincide with or approximate to each other and omit the verification with respect to a remaining color conversion pattern.

Provided is a change degree deriving device including a receiving unit that receives an image obtained by capturing an object and a known color body including plural color samples, the plural color samples including deterioration-series colors among colors used for the object, and each of the color samples having a known colorimetric value, a conversion rule generating unit that generates a conversion rule used to convert a color of the image received by the receiving unit into a colorimetric value in a device-independent color space based on the color samples included in the image received by the receiving unit, and a converting unit that converts a color of the object included in the image received by the receiving unit into a colorimetric value in the device-independent color space according to the conversion rule.

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.