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

Introduction : The posterize() function is an inbuilt function in Nodejs | Jimp which applies a posterize effect with n level. 
Syntax: 
 

posterize(n, cb)

Parameter: 
 

  • n – This parameter stores the amount to adjust the contrast and minimum threshold is two
  • 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
// sepia function
  image.posterize(4)
  .write('posterize1.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
// opaque function using callback function
  image.posterize(5, function(err){
    if (err) throw err;
  })
  .write('posterize2.png');
}
 
main();
  console.log("Image Processing Completed");

Output: 
 

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




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