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L*a*b* color mode of digital printing pattern

July 09, 2021

For digital printing, there are still many principles that cannot be mastered in half a month and a month. If you want to become an engineer in the digital printing industry, you also need to understand a lot of mechanics, mechanics and chromatics. The problems in the printing process will be solved quickly. Friends in the printing industry know that the color of the pattern is the company’s biggest explanation to customers. Today, I will share with you the color mode of the digital printing pattern.

Digital Printing Industry

Generally, the actual effect of textile inkjet printing is quite different from the effect displayed on the computer screen. This is not only related to the fabric and ink used, but also an important reason for the different color modes used by the monitor and the inkjet printer.

 

In color science, the color representation method is called color model or color model. The color model is used to describe the colors seen and processed by the human eye. Use numerical values ​​to represent Xeno. Different color modes have different methods of describing and classifying colors.

 

The color range generated by a specific color mode is called the color space. The color model determines the relationship between values, and the color space defines the absolute meaning of these values ​​as colors. Some color modes have a fixed color space (such as L*a*b* and XYZ), which are directly related to the way the human eye perceives colors, so they can be regarded as device-independent; while other color modes (such as RGB, HSL) , HSB, CMYK, etc.) may have many different color spaces, which are different for each related color space or device, so they are regarded as device-related.

 

L*a*b*color mode:

 

The L*a*b* color model is a unified color space established on the basis of the international standard for color measurement specified by the International Commission on Illumination (CIE) in 1931. This color model is based on the theory of the four-color opposition system. It expresses the color as light-dark, red-green and yellow-blue color chromaticity changes. The L*a*b* color space model can be represented by three coordinate axes: the L-axis surface brightness, ranging from 0 to 100; the a-axis represents the chromaticity from green to red; the b-axis represents the chromaticity from blue to yellow . A color cannot contain red and green components at the same time, nor can it contain yellow and blue components at the same time. The L*a*b* color model is based on this fact. On the a-axis, the positive direction indicates the red component of the color, and the negative value indicates how much green component is included; on the b-axis, the positive direction indicates yellow, and the negative value indicates blue.

 

L*a*b* is the color space of human vision. It is based on the only principle of vision, that is, the same amount of movement in the color space causes the same color change in the eyes of the eye, and it is a uniform chromaticity space. The L*a*b* color space is the color space related to the equipment, which can produce colors that match various equipment, such as the colors of monitors, printers, scanners, printers, etc., and can be used as a connection space to realize various equipment Color conversion between. I think that L*a*b* color mode is a color mode that has nothing to do with the device, whether it is provided on the display device or the output device-consistent colors, it solves the problem of different screens or different printer devices displaying different colors, and it is also Adobe Postscript (1evel2 and 1evel3) output language standard heap color mode and color management Icc (International Color Committee) device Prome file color mode, and it is also the intermediate color mode in the color mode conversion. In order to minimize the color inconsistency in the color mode conversion process, in the process of converting RGB color mode to CMYK mode, first convert RGB color mode to L*a*b* color mode, and then use L*a* The b* color mode is converted to the CMYK color mode, and the L*a*b* color mode is also used as an intermediary in the process of converting the cMYx color mode to the RGB color mode.

Digital Printing Industry

Many professional design software provide L*a*b* color mode. The range of L value in the software is 0-100; the range of a value is -128~~+127; the range of b bit is -128~~十127. In addition, there is a 24-bit true color format image, which also uses the L*a*b* mode, but this 24-bit true color is very different from the 24-bit true color of RGB. Among the current common bitmap file formats, only the TIFF format supports L*a*b* 24-bit true color.

 

Zhengzhou New Century Digital Technology Co., Ltd.,- (Fedar Printer:www.fedar.com.cn)is a high-tech enterprise specializing in research, manufacture, sale and service of sublimation printer,digital textile printer ,inkjet heat transfer printing machine and related consumables.

 

By cooperating with world famous printhead manufacturers and software suppliers, we integrate exquisite and practical technology into our products. Up to now, fedar printer has independently developed a series of mature products.
Digital Printing Industry