Node Jimp | posterize

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:



Example 1:

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// 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");

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Output:

Example 2: With cb (optional parameters)

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// 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");

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Output:

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



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