Working Principle of a Colorimeter

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2017-10-16

Working Principle of a Colorimeter

 The basic working principle of a colorimeter.

  Color is a question about sensation and subjective interpretation. 

Even if they look at the same object, people will express the same color with vastly different words based on different standards and experiences. 

Therefore, expressing colors in words is complex and difficult. However, colorimeters digitize colors in order to more intuitively express the differences in colors.

  The basic working principle of a colorimeter. 

A colorimeter is an optical measuring instrument that simulates the human eye's perception of red, green, and blue light. 

However, how to use a colorimeter to digitize color data? 

The color world is composed of three attributes: hue, brightness, and color saturation. 

By establishing scales for color tone, brightness, and saturation, we can measure colors using numbers. 

Nowadays, the color space method has been used worldwide for expressing color digitization.

  The basic working principle of a colorimeter. 

The colorimeter can measure and display the color difference between the sample and the standard sample 

based on the Lab principle of CIE chromaticity space Δ E and Δ A Δ B Δ L value. ∆ E * ab is defined as the total color difference of the sample, 

but it cannot represent the offset direction of the sample's color difference. 

The larger the value of ∆ E * ab, the greater the color difference.

The value of E * ab depends on the requirements of different companies. 

Generally, if ∆ E * ab is greater than 1, the color difference can be distinguished by the human eye.