Color difference meter has a wide range of applications in the surface color industry such as coating, building materials, paint, coatings, textile printing and dyeing, ink, plastics, dye pigment manufacturing, etc., also known as CIELAB uniform color space. Let's analyze the Lab values according to the color difference measurement interface:
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Color difference meter lab value meaning:
L: (Brightness) axis represents black and white, 0 is black, 100 is white.
a: (red green) Positive values are red, negative values are green, and 0 is neutral.
b: (yellow blue) Positive values are yellow, negative values are blue, and 0 is neutral.
All colors can be perceived and measured through the Lab color space, and these data can also be used to represent the color difference between the standard sample and the test sample, and are usually expressed as dE*ab (total color difference) dL*, da*, db*.
When dE is between 0-1, the color difference is not discernible to the naked eye
If the dE is between 1-2, the human eye is slightly aware, if the chromatic sensitivity is not high, it is still not visible.
If the dE is between 2-3, the color difference between the substances can be slightly clearly identified, but it is relatively not obvious.
Once dE reaches between 3.5-5, the color difference is very obvious
So dE above 5 looks like two colors.
Such as color difference treasure data:
dL* is 22.6 positive, indicating that the test sample is lighter (whiter) than the standard sample, and the interface will directly display how white and less black; If dL* is negative, the test sample is darker (darker) than the standard sample.
da* is 47.7 positive, indicating that the test sample is more red than the standard sample (reddish), and the interface will directly display more red and less green; Conversely, if da* is negative, the test sample is greener than the standard sample (greenish).
Db* is 43.4 positive, indicating that the test sample is more yellow than the standard sample (yellowish), the interface will directly display more yellow and less blue; Conversely, if db* is negative, the test sample is bluer than the standard sample (bluer).
dE*ab(or dE) is the total color difference, it does not indicate the direction of the color difference shift, the greater the value indicates the greater the color difference.
Color difference formula: dE=[(dL)2+(da)2+(db)2]1/2.
dL=L Tested product -L standard sample (brightness/black and white difference)
da=a Tested product -a standard sample (red/green difference)
db=b Tested product -b standard sample (yellow/blue difference)
△L+ means white, △L- means black
△a+ is red, △a- is green
△b+ indicates yellow, △b- indicates blue
Overall, the color difference meter is a convenient operation, intuitive data detection of color difference equipment, currently in the daily production and life process is very widely used, so the need for color management friends can carefully study the meaning of the above Lab value.