What do the Lab and LCh values in a colorimeter mean?
Shenzhen Nuoi Technology Co., Ltd
We're a leading supplier of measuring instrument, focused on colorimeter,dry film thickness gauge,haze meter, etc.
When using a colorimeter, some customers report that they could not understand what the LabCh data means? LabCh is two color space data, Lab and LCh.
What is a color space?
Since color is the different perception of the human eye to light of different frequencies, color is both objective and subjective, and there are differences in understanding. Color space is a way to represent color in a multi-dimensional numerical manner under the same observation conditions . Linshang colorimeter series products have seven color spaces: Lab, Luv, LCh, Yxy, CMYK, RGB, and Hex.
Lab is one of the color spaces. It is independent of the device and can represent the most colors. Therefore, Lab is also the most commonly used color space in colorimeter and even in color-related industries.
What does Lab mean?
Let's look at the picture above. Lab is a three-dimensional spherical model.
The three data of L, a, and b can accurately express a color value.
What does LCh stand for?
In addition, we see two groups of data, Ch, under Lab. When combined with L, they form another color space, the LCh color space.
The LCh color space uses a similar approach to Lab, but it uses L to represent lightness, C to represent saturation, and H to represent hue angle values to obtain cylindrical coordinates. Since it can be directly converted from Lab, it is often displayed together.
From the color difference comparison interface, we can read the Lab and LCh color data of the standard and sample respectively. The color difference value ΔE and color deviation prompt are calculated based on the Lab data.
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