How to resize an image in Node Jimp?

NodeJS – Resize() is an inbuilt function that is used to resize the images to the desired size. We can use resize to set the height and width using a 2-pass bilinear algorithm. It can resize an image into any size as declared by the user. We can take input from the user or resize it into fixed Width*Height size.

Syntax

resize(w, h, mode, cb)

Definition of resize() paramters

• w – This parameter is used to declare the width of the image. This is a required parameter.

• h – This parameter is used to declare the height of the resized image. This parameter is also required.

• mode – This is an optional parameter that is used to store the scaling method.

• cb – This is also an optional parameter that can be invoked after the compilation is complete.

Input Image

Using Node JIMP – RESIZE()

Before proceeding to use resize() 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 resize.js file and copy-paste the following code snippet in it.

• Use node resize.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 resize() { // Function name is same as of file name
   // Reading Image
   const image = await Jimp.read
   ('/home/jimp/tutorials_point_img.jpg');
   image.resize(200,200, function(err){
      if (err) throw err;
   })
   .write('/home/jimp/resize.jpeg');
}

resize(); // Calling the function here using async
console.log("Image is processed successfully");

Output

Using Node JIMP – RESIZE() with 'cb' optional parameters

Example

const Jimp = require('jimp') ;
async function resize() {
   // Reading Image
   const image = await Jimp.read
   ('/home/jimp/tutorials_point_img.jpg');
   // Used RESIZE_BEZIER as cb for finer images
   image.resize(1024,768,Jimp.RESIZE_BEZIER, function(err){
      if (err) throw err;
   })
   .write('/home/jimp/resize.jpeg');
}

resize();
console.log("Image is processed successfully");

Output