Node Jimp | brightness - GeeksforGeeks

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:

Example 1:

// 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)

// 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"); 

Output:

Reference: https://www.npmjs.com/package/jimp

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