An example of a system for selecting print mode configurations is disclosed. The example disclosed herein comprises an array of nozzles to eject ink, and a controller. The controller is to instruct the array of nozzles to print a plurality of color patches, each color patch being printed using different nozzle setting values. Also, the controller is to receive a sensor signal from each color patch from a color sensor. The controller is further to derive color saturation and/or density measurement information from the sensor signals; and to select a print mode configuration based on the color saturation and/or density measurement information.

An image identification method for printing on rigid substrates includes the steps of: defining a digital graphic design representative of a rigid substrate to be produced; spreading a soft layer of granular or powder ceramic material on a deposition surface; pressing the soft layer to obtain a compacted layer; acquiring a real image of the compacted layer, detecting keypoints of the real image; comparing the keypoints of the real image with keypoints of an image obtained or derived from the digital graphic design; and calculating a portion of the digital graphic design corresponding to a portion of the real image. An image identification system for printing implementing the described method and a corresponding printing method/system are also described.

An image forming apparatus includes circuitry. The circuitry extracts a colorimetric area from an image formation area based on designation according to an operation by a user, the image formation area in which an image as a print target is to be formed. The circuitry calculates a color difference between a first page and a second page subsequent to the first page based on a colorimetric value in the extracted colorimetric area and to determine whether to continue printing according to the calculated color difference.

For determining a match factor regarding color match of a printed product with target values for colors, measuring fields of a printout are spectrally measured and actual measured values of the printout recorded. The target values are compared with actual measured values by determining for the printed product a color value axis from a unique color value as a start point to a second unique color value as end point and interpolation points between the first and second unique color values; determining target values for start and end points and interpolation points; determining actual measured values for start and end points and interpolation points of the printout from the actual measured values; determining a distance value representing the distance between target value and actual measured value for each start point, end point, and interpolation point; and calculating and outputting the match factor as statistical average of the distance values.

An image forming apparatus includes circuitry. The circuitry extracts a colorimetric area from an image formation area based on designation according to an operation by a user, the image formation area in which an image as a print target is to be formed. The circuitry calculates a color difference between a first page and a second page subsequent to the first page based on a colorimetric value in the extracted colorimetric area and to determine whether to continue printing according to the calculated color difference.

An image forming system includes an image forming unit, a sensor, and a controller. The controller is configured to control the sensor based on measurement modes including a first measurement mode and a second measurement mode. A sampling number of an image by the sensor while the sensor moves in the direction orthogonal to the conveying direction in the first measurement mode is less than a sampling number of an image by the sensor while the sensor moves in the direction orthogonal to the conveying direction in the second measurement mode.

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.

A method includes obtaining first color information for each of a plurality of first samples of a first target color with a color measurement device connected to a computing device including a display. A digital color image of at least one first target color is displayed on the display. An offset value for each first target color is determined such that the digital color image of each first target color matches the corresponding first target color on each of the first samples. A second sample including a second target color is scanned to obtain second color information. A processor of the computing device determines, using the offset values of the first target colors, an interpolated offset for the display such that the digital image of the second target color matches the second target color.

There is provided with an information processing apparatus. A first obtaining unit obtains data of a reference image indicating a target of printing output to be performed by a printing apparatus. A second obtaining unit obtains data of an image printed by the printing apparatus. A correcting unit corrects a local image density difference or the reference image based on a global image density difference between the reference image and the printed image. An evaluating unit evaluates quality of the printed image based on the local image density difference between the corrected reference image and the printed image.

A method performed by an image forming apparatus is provided. The method includes receiving an input of selecting a first color from a first color image, scanning, a reference image including at least one reference color that is used to reproduce a color, receiving an input of selecting a second color from the at least one reference color, based on scan color data in which characteristics of the image forming apparatus obtained by scanning a color compensation chart representing a color space have been reflected, determining a second color scan value of the second color as a second color value of the second color from which the characteristics of the image forming apparatus have been removed, and converting a first color value of the first color into the second color value of the second color and outputting the first color image having the second color instead of the first color.