p5.js brightness() function

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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); 
} 