A printing system is disclosed. The printing system includes at least one physical memory device to store ink model estimation logic and one or more processors coupled with the at least one physical memory device to execute the ink model estimation logic to receive a first plurality of ink deposition curves each associated with one of a plurality of primary color inks of a print system, wherein the associated primary color inks in combination represent a first secondary color, receive a color space mapping profile for the print system, wherein the color space mapping profile characterizes a relationship between a first color space and a printer color space of the print system and generate a color space ink model for the first secondary color based on the first plurality of ink deposition curves and the color space mapping profile, wherein the color space ink model represents a relationship between each of a plurality of parameters of the first color space and ink deposition.

The disclosure discloses methods and systems for handling drifting of colors in printing. The method includes receiving a document including the image for printing, the image includes one or more gray and non-gray portions. An input from a user to selectively adjust the color of the gray portions of the image is received. The gray portions of the image are identified. Then, color values associated with the identified gray portions of the image are determined. Based on the user input, the determined color values associated with the gray portions of the image are selectively adjusted, without affecting non-gray color portions of the image to generate an updated image. The updated image is printed and the printed image includes adjusted color for the gray portions of the image such that gray color in the printed image is consistent with gray color of the image in the document.

In some examples, in a component space defined by a plurality of edges, a system defines a first point on a first edge of the plurality of edges, the first point dividing the first edge into a first portion in which a first component is to be used in producing an output by an output device, and a second portion in which the first component is not used in producing an output by the output device, where a first space inside the component space corresponding to the first portion is to use the first component in producing an output by the output device, and a second space inside the component space corresponding to the second portion is to not use the first component in producing an output by the output device. The system generates values of an internal node within the component space by interpolating between a first node on the first edge and a second node on a second edge of the plurality of edges, where the interpolating is along an interpolation axis based on a boundary between the first space and the second space.

The present invention provides a fully integrated digital workflow for the designing and production of packaging. A designer creates a package design with a special effect ink digitally, using a computer connected to a color database and a special effect ink database. Advantageously, the present workflow minimizes the complexity of the workflow by using transparent color layers printed over plain special effect additive ink layers to develop the special effect inks to be used on press. The present workflow advantageously can also be used to assess match of polychromatic inks.

There are provided a conversion processing method of performing LUT conversion processing for converting, via a lookup table (LUT), texture characteristic information of an object of which texture is to be reproduced into ink amount information of an ink, which is used in order to reproduce the object of which texture is to be reproduced on a medium, the conversion processing method for optical texture reproduction in which the texture characteristic information is separated into internal scattering information and color signal information, the internal scattering information and the color signal information, which are separated out, are used as inputs of the LUT conversion processing, and as values of a modulation transfer function as the internal scattering information and the color signal information are used in the LUT conversion processing, reproduction of internal scattering and reproduction of color reproduction, which are important qualities of texture, can be simultaneously realized with high accuracy in print production of performing texture reproduction, a printed material production method, and a printed material production system.

An image processing apparatus according to the present invention includes an image forming unit configured to form an image, a measuring unit configured to measure the formed image, a control unit configured to control execution of a single-color calibration to be performed to correct reproduction characteristics of a single-color formed by the image forming unit based on a measuring result of a single-color image formed with a single-color recording agent and execution of a multi-color calibration to be performed to correct reproduction characteristics of a multi-color image formed by the image forming unit based on a measuring result of a multi-color formed with a plurality of recording agents, and a selection unit configured to select whether to cause the control unit to perform the multi-color calibration after completing the single-color calibration or cause the control unit to perform any one of the single-color calibration and the multi-color calibration.

A colorimetric method is executed by a server that communicates with an information processing apparatus coupled to a printing apparatus and to a colorimetric device. The method includes: creating work information that includes print commanding information related to a command to print a chart image based on chart information and also includes colorimetry commanding information related to a command to perform colorimetry for the chart image; storing the work information; transmitting the print commanding information to the information processing apparatus; causing the information processing apparatus to command, according to the print commanding information, the printing apparatus to print the chart image; transmitting the colorimetry commanding information to the information processing apparatus; and acquiring colorimetry result information created as a result of the colorimetry performed for the chart image by the colorimetric device.

The occurrence of image quality adverse effects, such as interference fringes and color bleeding, is suppressed for an object including a spot color adjustment-target color. In a case where a spot color adjustment function is made use of, the same color separation table is caused to be applied uniformly, instead of switching color separation tables to be applied to an adjustment-target color depending on whether the object attribute is text/line/graphics, or image.

Certain examples described herein relate to adjusting a printing system. In certain cases, a lookup table, LUT, is obtained where the lookup table comprises a plurality of nodes that map a plurality of input first color space values to a plurality of Neugebauer Primary area coverage, NPac, vectors in a second color space and each NPac vector comprises at least one Neugebauer Primary, NP. Each NPac vector in the LUT is adjusted by the determination of a colorimetric value of the NPac vector and the modification of the NPac vector based on a characteristic of the corresponding at least one NP and the colorimetric value such that the modification is specific to the NPac vector. The lookup table is updated with the modified NPac vector and stored for referral by the printing system in any future printing.

A printing device includes: an ink system having a plurality of types of inks; an image input unit accepting an input of an image to be printed; a print condition selection unit accepting a selection of N types of print conditions used when printing the image, N being an integer equal to or greater than 2; an application rate input unit accepting an input of an application rate of each of the N types of print conditions that are selected; a first ink amount calculation unit calculating an expected amount of ink of each of the plurality of types of inks used when it is assumed that the image is printed using singly each of the N types of print conditions that are selected; a second ink amount calculation unit calculating an actual amount of ink used when printing the image, using the expected amount of ink corresponding to each of the N types of print conditions and the application rates of the N types of print conditions; and a printing unit executing printing of the image according to the actual amount of ink.