p5.js lightness() function
Last Updated :
10 Aug, 2023
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The lightness() function in p5.js is used to extract the HSL lightness value from a color or pixel array.
Syntax:
javascript
Output:
Example 2: This example uses lightness() function to extract the HSL lightness value from pixel array and use it as grayscale value.
javascript
Output:
Reference: https://p5js.org/reference/#/p5/lightness
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);
}
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);
}
