Whats the Meaning of Lab?

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2017-05-10

Whats the Meaning of Lab?

By measuring the color sample with a colorimeter, the Lab value obtained from the measurement can be displayed on the screen. 

So, in the process of product color management, should we mainly focus on the Lab value or the calculated color difference value? The following text will briefly introduce it to everyone.

When using a colorimeter, the main focus is not on the measured Lab values, but on referring to the standard color sample and calculating the Δ L, Δ a, and Δ b values of the sample.

How to read the Lab value of colorimeter?

△ L=L sample - L standard (brightness difference)

△ a=a Sample - a Standard (Red/Green Difference)

△ b=b sample - b standard (yellow/blue difference)

△ L+represents off white, △ L - represents off black

△ a+indicates reddish tint, △ a - indicates greenish tint

△ b+represents yellowish color, △ b - represents bluish color

Among them, △ L *, △ a *, △ b * are the differences in brightness L * and chromaticity index a *, b * between the reference sample and the measured sample. 

The color difference value is represented by △ E, which is a comprehensive colorimeter. 

The specific calculation method is related to the brightness difference △ L, red green difference △ A, and yellow blue difference △ B.