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What is the difference between RGB and tristimulus values and LAB?

Source: Colorimeter Browse: Release Date: 2019-08-19

In order to ensure the color quality of products, we often use professional colorimeters and spectrophotometers to test, so as to ensure that the products produced are within the preset acceptable range, so why is the measured color expressed by LAB? Instead of using RGB, this article will briefly introduce it for everyone.

Difference between RGB and LAB

What is RGB?

People often think that colors are measured in RGB, just like the color representation methods of computer monitors and TV screens are RGB color modes. We can even manually adjust RGB parameters to create custom colors for fonts on computers. Indeed, with different RGB ratios, any color that can be seen by the naked eye in nature can be mixed. RGB is also known as the three primary colors, where R stands for red, and the acronym Red is selected. Similarly, G stands for Green and B stands for Blue. RGB mode is also called RGB color space. This is a mode of color light representation. Most devices that can emit light are RGB color modes applied. Since the RGB mode is so widely used, why should the color parameters detected by the color difference meter be expressed by LAB instead of RGB?

The difference between CIE tristimulus value and RGB:

In simple terms, the difference between the CIE tristimulus values XYZ, LAB and RGB lies in their purpose in color representation. RGB is a device-dependent method of generating colors, which is not enough for expressing the quality of products, and it is difficult to achieve the purpose of quality control. The CIE xyz color scale represents the true color of an object, while RGB describes a flat solid color representation that displays the average color of the object on the screen. One is used to provide color directionality (RGB) and the other is used to accurately quantify color (three stimuli). value).

RGB is a chromaticity coordinate of additive color mixing. The user represents the color on the digital device. RGB uses different colors of light from 0 to 255 to mix to generate different colors. The RGB color scale created here displays the color digitally in pixels, where The combination of red, green, and blue phosphors is the color you see on a computer, TV, or mobile phone screen.

Long before the invention of television, the International Commission on Illumination (CIE) believed that the XYZ color model is a standard conversion of visible light. It is a color model formed based on human visual perception. CIE XYZ uses a mathematical table to represent colors. Internal wavelength stimuli are weighted. The X value is a red stimulus, the Y value is a green / yellow stimulus, and the Z value is a blue stimulus. The CIE tristimulus color scale xyz, LAB quantifies the color perceived by humans. At the same time, the CIE tristimulus value is very accurate, and the color can be expressed as the second place after the decimal point. This means that not only can more colors be represented with this color mode, but they are also more accurate.

Which color is better for RGB and LAB?

If you need to modulate a special "white" concrete, then do we use RGB or tristimulus values? It depends on the specific color you want to "white". Using RGB mode to measure white, it is difficult to accurately analyze the specific formula for color matching. Although we know that white can be mixed by a certain ratio of RGB, but it is not accurate enough for specific colors.

The CIE tristimulus value can provide three-dimensional color coordinates, providing you with a very accurate way to modulate the "white" concrete colorant ratio, so that your coloring results can be more accurate.

The above is the full text of "What is the difference between RGB and LAB?", If you want to know more about color detection, you can pay attention to the subsequent updates of this column!

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