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How to apply Posterize to an image in Node Jimp?
NodeJS – Posterize() is an inbuilt function that is used to apply posterize to images upto the level 'n'. The n will be the input parameter.
Syntax
posterize(n, cb)
Definition of posterize() paramters
n – It will take input to adjust the posterize level. Minimum value possible is 2.
cb – This is an optional parameter that can be invoked after the compilation is complete.
Input Image
Using Node JIMP – POSTERIZE()
Before proceeding to use posterize() functions, please check that the following statements are already executed for setting up the environment.
npm init -y // Initialising the Node environment
npm install jimp --save // Installing the jimp dependency
Create a posterize.js file and copy-paste the following code snippet in it.
Use node posterize.js to run the code.
Note − The method name should match with the JS file name. Only then it will be able to call the desired method.
Example
const Jimp = require('jimp') ; async function posterize() { // Reading Image const image1 = await Jimp.read ('/home/jimp/tutorials_point_img.jpg'); image1.posterize(5) .write('/home/jimp/posterize.jpg') } posterize(); // Calling the function here using async console.log("Image is processed successfully");
Output
Using Node JIMP – Posterze() with 'cb' parameters
Example
const Jimp = require('jimp') ; async function posterize() { // Reading Image const image = await Jimp.read ('/home/jimp/tutorials_point_img.jpg'); image.posterize(10, function(err){ if (err) throw err; }) .write('/home/jimp/posterize.jpg'); } posterize(); console.log("Image is processed successfully");