The lightness() function in p5.js is used to extract the HSL lightness value from a color or pixel array.
Syntax:
lightness(c)
Parameters: This function accepts single parameter c which stores the p5.Color object, color components, or CSS color.
Below programs illustrate the lightness() function in p5.js:
Example 1: This example uses lightness() function to extract the HSL lightness value from pixel array.
function setup() {           // Create Canvas of size 300*80     createCanvas(300, 80); }   function draw() {           // Set background color     background(220);           // Initialize color mode to HSB     colorMode(HSL, 255);           // Initialize the parameter     let c = color(0, 126, 100);           // Sets 'value' to 100     let value = lightness(c);       // Set the font size     textSize(16);       // Set the font color     fill(color('red'));           // Display result     text("Lightness Value is : " + value, 50, 30); } |
Output:
Example 2: This example uses lightness() function to extract the HSL lightness value from pixel array and use it as grayscale value.
function setup() {           // Create Canvas of size 300*80     createCanvas(300, 180); }   function draw() {           // SEt background color     background(220);           // Initialize color mode to HSB     colorMode(HSL, 255);           // Initialize the parameter     let c = color(56, 126, 10);           // Sets 'value' to 10     let value = lightness(c);           // Fill the color value     fill(value);           // Create rectangle     rect(50, 15, 35, 70);           // Display result     text("Value of Lightness is : " + value, 22, 110); } |
Output:
Reference: https://p5js.org/reference/#/p5/lightness
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