p5.js brightness() function

The brightness() function in p5.js is used to extract the HSB brightness value from a color or pixel array.

Syntax:

brightness(c)

Parameters: This function accepts single parameter c which stores the p5.Color object, color components, or CSS color.

Below programs illustrate the brightness() function in p5.js:

Example 1: This example uses brightness() function to extract the HSB brightness value from a color or 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(HSB, 255);
      
    // Initialize the parameter
    let c = color(0, 126, 100);
      
    // Sets 'value' to 100
    let value = brightness(c); 
      
    // Set the font size
    textSize(16);
      
    // Set the font color
    fill(color('red'));
      
    // Display result
    text("Brightness Value is : " + value, 50, 30);
}

Output:

Example 2: This example uses brightness() function to extract the HSB brightness value and fill it as gray scale integer value.

function setup() {
  
    // Create Canvas of size 300*180
    createCanvas(300, 180);
}
  
function draw() {
      
    // Set background color
    background(220);
      
    // Initialize color mode to HSB
    colorMode(HSB, 255);
      
    // Initialize the parameter
    let c = color(0, 126, 100);
      
    // Sets 'value' to 100
    let value = brightness(c); 
      
    // Fill the color 
    fill(value);
      
    // Create rectangle
    rect(50, 15, 35, 70);
  
    // Display result
    text("Value of brightness is : " + value, 22, 110);
}