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Node Jimp | fade
  • Last Updated : 19 Feb, 2021

Introduction 
The fade() function is an inbuilt function in Nodejs | Jimp which fades each pixel by a factor between 0 and 1. 
Syntax: 
 

fade(f, cb)

Parameter: 
 

  • f – This parameter stores the value by which image is made transparent. It has a range of 0 to 1. 1 will turn the image completely transparent.
  • cb – This is optional parameter which is invoked when compilation is complete.

Input Images: 
 

 



Step 1 : Setting up environment 

npm init -y

Step 2 : Install jimp

npm install jimp --save

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
// fade function
  image.fade(.5)
  .write('fade1.png');
}
 
main();
  console.log("Image Processing Completed");

Output: 
 

Example 2: With f and 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
// fade function using callback function
  image.fade(0.8, function(err){
    if (err) throw err;
  })
  .write('fade2.png');
}
 
main();
  console.log("Image Processing Completed");

Output: 
 

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




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