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Method for high-fidelity print outputting L*a*b* image

A printing output and image input technology, applied in the field of image processing, can solve the problems of large color difference, low precision, complex and time-consuming, etc., and achieve the effect of high-precision real-time conversion

Inactive Publication Date: 2009-02-11
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the invention is to provide a high-fidelity print output L * a * b * The image method solves the existing method to convert the image from L * a * b * The problems of complex time-consuming, low precision and large color difference in the process of converting to CMYK

Method used

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  • Method for high-fidelity print outputting L*a*b* image
  • Method for high-fidelity print outputting L*a*b* image

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] L * a * b * The color value of each pixel in the image is represented by L * a * b * Color space to represent, Lab mode is based on CIE 1976L * a * b * A color mode created, the Lab mode consists of three channels, the first channel is psychological lightness, that is L, its value ranges from 0 to 100, the larger the value, the greater the lightness value of the color. The other two are chroma channels, the a channel represents the red and green reflection of the color; the b channel represents the yellow and blue reflection of the color. The value range of a and b is -128~127. For a, the larger the value, the redder the color; on the contrary, the smaller the value, the greener the color; the larger the b value, the yellower the color, otherwise, the value The smaller it is, the bluer the color. When storing, in order to eff...

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Abstract

The invention discloses a method for printing and outputting an L<*>a<*>b<*> image in a high-fidelity manner. The method is carried out according to the following steps: step 1, firstly arranging a CMYK electronic color target, and then measuring the L<*>a<*>b<*> value of each color block aiming at a colored output device and through taking the CMYK electronic color target arranged as an input image after being printed and output, and corresponding and storing the CMYK value and the L<*>a<*>b<*> value of each color block to obtain source data for describing the characteristic of the device; step 2, reading the data of the L<*>a<*>b<*> image and carrying out color gamut compression; and step 3, establishing color conversion relation between L<*>a<*>b<*> and CMYK to convert the L<*>a<*>b<*> image into a CMYK image, and printing and outputting. The invention has the advantages that a CMYK printer is taken as an output device, thereby achieving the highly-accurate conversion from the L<*>a<*>b<*> and the CMYK, and achieving the purpose of printing the L<*>a<*>b<*> image in a high-fidelity manner.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a high-fidelity print output L * a * b * image method. Background technique [0002] At present, various color images are mainly based on RGB, CMYK and L * a * b * Three color spaces for recording, RGB and CMYK are device-dependent color spaces, so this type of image can be directly output on devices such as monitors and printers; L * a * b * It is a uniform color space and a device-independent color space, so this type of image cannot be directly output by a color device. due to L * a * b * space is a non-device color space, so when outputting such an image, it must first be converted to a device color space value. However, at present, the CMYK printer is used as the output device, and the L * a * b * The conversion method to CMYK is complex and time-consuming, with low precision and large color differences, making it difficult to achieve high-fidelity prin...

Claims

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Application Information

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IPC IPC(8): H04N1/60
Inventor 孙帮勇周世生
Owner XIAN UNIV OF TECH
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