Provided is an image area extraction method for extracting an image area of an object from a color image of obtained color image data. The image data extraction method includes converting RGB values of each pixel in the color image data into HSV values, performing threshold processing to binarize at least one of the converted S and V values of each pixel so that it will be converted into HSV values, generating composite image data including an X value, a Y value, and a Z value for each pixel, the X value, the Y value, and the Z value being obtained by adding values according to predetermined one-to-one combinations between any one of an R value, a G value, and a B value and any one of an H value, an S value, and a V value, and extracting the image area using the composite image data.

A method for improving the abrasion resistance of a printed image, the image being processed digitally by a colour management system for a print process comprising a set of colorants, the colour management system transforming a colour of a part of the image into a colorant coverage for said part of the printed image, wherein a sum of coverage values for all colorants in the set of colorants is larger than a user-selectable threshold value. In a preferred embodiment the set of colorants includes a colorless, transparent colorant.

Certain examples described herein relate to the halftoning of a color image. In one example, a set of clusters are determined based on the color image. A set of edges are also detected in the color images. Clusters within these edges are then merged. A set of screens for halftoning are assigned to the set of clusters. This assignment is based on color property metrics for the set of clusters. The color image is halftoned using the set of screens assigned to the merged clusters.

A printing method includes: a color space conversion step; a gradation determination step of determining whether a pixel group forms a gradation; and a gradation region ink amount calculation step of calculating an ink amount of the pixel group determined to form the gradation. The gradation region ink amount calculation step includes an array information acquisition step of acquiring whether pixel values are arranged linearly, in a planar manner, or in a polyhedron manner in a uniform color space, a grating color value calculation step of determining a grating color value which is a color value of a grating point in the array, a grating ink amount calculation step of calculating, using the determined grating color value, a grating ink amount which is an ink amount of the grating point in the array, and an interpolation calculation step of calculating an ink amount of the pixel group determined to form the gradation by interpolation using the calculated grating ink amount.

The present disclosure provides a color correction method, including: in response to original color data of a pixel, converting the original color data into original color coordinates in an original color space; mapping the original color coordinates to a sampling point space to obtain a mapped point corresponding to the original color coordinates in the sampling point space, and determining, according to mapped coordinates of the mapped point, a plurality of reference point coordinates corresponding to the mapped coordinates; obtaining reference point addresses of the reference point coordinates, and simultaneously reading color data of the reference point coordinates according to the reference point addresses; and obtaining corrected color data of the pixel through an interpolation algorithm according to the color data of the reference point coordinates. The present disclosure further provides a Field Programmable Gate Array, a chip and a display device.

The present disclosure relates to a color vector conversion method and device suitable for a display device. The method includes determining a three-dimensional vector of a first intersection point according to the three-dimensional vector of the to-be-converted point and a three-dimensional vector of a reference point. The method includes determining a three-dimensional vector of a second intersection point according to the three-dimensional vector of the first intersection point and a three-dimensional vector of a first vertex. The method includes converting the three-dimensional vector of the second intersection point to an N-dimensional vector according to N-dimensional vectors of two endpoints located on the first side. The method includes determining an N-dimensional vector of the first intersection point according to the N-dimensional vector of the second intersection point. The method includes determining an N-dimensional vector of the to-be-converted point according to the N-dimensional vector of the first intersection point.

An image reading apparatus is configured to read image data generated by reading a window within a junction of a carrier sheet and then to determine whether the target object is a carrier sheet, based on a total height of a first area and a plurality of second areas arranged with the first area therebetween in a transport direction as well as a first color width. In the first area, pixels in a second color are sequentially arrayed in the transport direction; in the second areas, pixels in a first color are sequentially arrayed in the transport direction; and the first color width indicates a length of an area in which a plurality of pixels in the first color are sequentially arrayed in a width direction.

A method for inkjet printing machine color control includes color transformation of print data from first color space to process color space in a first stage using a computer transforming print data from the first to an intermediate color space while keeping special colors, and a second stage transforming corrected print data including special colors from intermediate to process color space. The computer uses print data corrected after the first stage as second stage starting values. Print data transformed into the process color space are printed. First color space corresponds to CMYK, flexographic printing or RGB color space with special colors, intermediate color space corresponds to CMYK color space with special colors, process color space corresponds to CMYK color space with additional process colors. The computer corrects CMY, not K print data or special not transformed colors, when correcting print data in the intermediate color space after the first stage.

Image data expressed in a first color space is converted into an expression in a second color space to be used during rendering by using a color conversion profile, and converted image data is generated. A setting related to an application to physically-based rendering is performed on a parameter to be used when performing physically-based rendering on a print medium as a 3D object and related to an appearance of the print medium, the physically-based rendering of a printed print medium on which an input image is printed is performed using the set parameter, and a rendering image corresponding to an appearance of the print medium in a virtual space is displayed in a mode in which a difference in applications of the parameter during rendering is comparable.

An image processing apparatus comprising: a decision unit configured to decide a first color mapping method to a print color gamut for a first partial original based on a pixel value included in the first partial original and the print color gamut of a print unit and decide a second color mapping method to a print color gamut for a second partial original based on a pixel value included in the second partial original and the print color gamut of the print unit; and a color conversion unit configured to perform color conversion of the first partial original by the first color mapping method decided, and perform color conversion of the second partial original by the second color mapping method decided.