Node Jimp | brightness

Last Updated : 22 Feb, 2021

Introduction : The brightness() function is an inbuilt function in Nodejs | Jimp which adjusts the brightness of the image by a value of -1 to +1.

Syntax:

brightness(n, cb)

Parameter:

n – This parameter stores the amount to adjust the brightness, a number between -1 and +1
cb – This is an optional parameter which is invoked when compilation is complete.

Input Images:

Setup Environment :

npm init -y

Install Dependencies :

npm install jimp

Example 1:

javascript

// npm install --save jimp
// import jimp library to the environment
var Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
  const image = await Jimp.read
  ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185307/gfg28.png');
// contrast function
  image.brightness(.4)
  .write('brightness1.png');
}
 
main();
  console.log("Image Processing Completed");

Output:

Example 2: With cb (optional parameters)

javascript

// npm install --save jimp
// import jimp library to the environment
var Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
  const image = await Jimp.read
  ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png');
// contrast function using callback function
  image.brightness(-.5, function(err){
    if (err) throw err;
  })
  .write('brightness2.png');
}
 
main();
  console.log("Image Processing Completed");