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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