D3.js | d3.lab() Function

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The d3.lab() function in D3.js is used to construct a new Lab color and returns ‘l’, ‘a’ and ‘b’ properties of the specified color taken as the parameter of the function.

Syntax:

d3.lab(color);

Parameters: This function accepts single parameter color which is specified CSS color.

Return Value: This function returns ‘l’, ‘a’ and ‘b’ properties of the specified CSS color taken as the parameter of the function.

Below programs illustrate the d3.lab() function in D3.js:

Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>d3.lab() function</title> 
  
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
    <script> 
          
        // Calling the d3.lab() function 
        // with some parameters 
        var color1 = d3.lab("red"); 
        var color2 = d3.lab("green"); 
        var color3 = d3.lab("blue"); 
        
        // Getting the LAB properties 
        console.log(color1); 
        console.log(color2); 
        console.log(color3); 
    </script> 
</body> 
  
</html> 

Output:

{"l":53.24079414130722, "a":80.09245959641109, "b":67.20319651585301, "opacity":1}
{"l":46.22743146876261, "a":-51.69849552989111, "b":49.8968460010561, "opacity":1}
{"l":32.297010932850725, "a":79.18751984512224, "b":-107.8601617541481, "opacity":1}

Example 2:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>d3.lab() function</title> 
  
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
    <script> 
          
        // Calling the d3.lab() function 
        // without any parameters 
        var color = d3.lab(); 
        
        // Getting the LAB values 
        console.log(color); 
    </script> 
</body> 
  
</html> 

Output:

{"l":null, "a":null, "b":null, "opacity":1}

Reference: https://devdocs.io/d3~5/d3-color#lab

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