What is the unit of measurement result of colorimeter

How to see the measurement result of colorimeter? What is the unit? Many users in the use of colorimeter, do not know the above measurement results of each unit and the specific meaning of the representation, this article will provide a brief introduction to the basic knowledge of colorimeter.

20200903162011 - What is the unit of measurement result of colorimeter


What is the unit of color difference?

Colorimeter is widely used in plastic, printing and dyeing industries in the field of color management, it is mainly based on the CIE color space Lab, Lch principle to detect the degree of color difference between the sample and the item being measured. And color difference is also known as color phase difference, modern color difference assessment according to the standard color difference formula recommended by the International Illuminating Association (CIE) and using the instrument and computer measurement calculation, with precise numbers to express, often use CIE 1976L*a*b* and CIE 1976L*u*v* and other color difference formula to calculate color difference.
NBS color difference unit on the current people measure the color difference of a standard unit, which is the absolute value of Y1/2, a, b color difference formula calculated 1 as a unit, is the U.S. National Bureau of Standards in 1939 to implement the color difference calculation formula. One NBS unit is approximately equivalent to five times the visual chromatic aberration recognition threshold. If compared with the color difference value of two adjacent levels in the Menzel system, 1 NBS unit is approximately equal to 0.1 Menzel lightness value, 0.15 Menzel color value, 2.5 Menzel hue value (color is 1); the difference between two adjacent colors in the Menzel system is approximately 10 NBS units. As for the product color difference should allow many large range to be considered appropriate, according to the difference of human color perception to determine.

What is the unit of colorimeter?

1NBS color difference unit is actually a kind of unit under the color difference calculation formula, but there are many high-precision color difference meter products on the market contain a variety of color difference calculation formula, in this case we have no way to say that NBS is the unit of color difference meter. Although the units of different color difference companies are the same as NBS units, but in fact there will be some differences. So when applying different color difference formulas, the units of colorimeter are actually different.
NBS units used to be used as the units for all color difference formulas for a long time, but after the 1970s, with the appearance of a large number of color difference formulas (such as CIE 1976L*a*b* and CIE 1976L*u*v* above), it became imprecise and unnecessary to use the same standard calculation units across the board. In order to represent the color difference value more scientifically, people will directly use △ECIE, △ECMC no longer use NBS units.
It can be seen that the color difference meter actually does not have a fixed unit, so the user in the expression of the measurement results, just need to indicate what kind of color difference calculation formula can be.

How to see the color difference meter measurement results?

As already mentioned, colorimeter measurement application of different color difference formula, then we analyze the measurement results data will also be different. For example, our bench-top spectrophotometer CS-821N has ΔE*ab,ΔE*uv,ΔE*94,ΔE*cmc(2:1),ΔE*cmc(1:1),ΔE*00, DINΔE99,ΔE(Hunter) and other calculation formulas, supporting CIE LAB,XYZ,Yxy,LCh,CIE LUV,Musell s-RGB, HunterLab, βxy, DIN Lab99 and other color spaces, which can meet the various measurement needs of different users.
Data analysis of color difference meter:
To judge the color difference value, the international common is the color space representation, common color space are LAB, LCH, RGB, XYZ, YXY, etc., of course, the commonly used value or Lab value, which can indicate almost any kind of color, other color space is only for reference, customers rarely pay attention to. The following is an introduction to the meaning of Lab value.

  • L means black and white, also said light and dark, + means white bias, – means dark bias
  • A means red and green, + means reddish, – means greenish
  • B means yellow and blue, + means yellowish, – means blueish

CIE 1976L*a*b*uniform color space has a wide range of applications in many areas, usually we say the colorimeter measurement results unit will also use it to indicate .

Comprehensive view, the unit of color difference meter does not have a clear fixed unit, we usually will be based on different color difference formula to express the color difference value.

Source: China Color Measurement Solutions Provider – www.spectrumgfa.com
www.spectrumgfa.com is one of the leading china Colorimeter & Spectrophotometer Manufacturer, with professional factory. We focus on the colorimeters, spectrophotoemters, haze meters, gloss meters and spectral analysis instruments research and development, manufacturing, sales and service since the company been established. Our products is widely used on Painting,textile,plastic industry,food,building material and other products. 
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