Node Jimp | normalize

The normalize() function is an inbuilt function in Nodejs | Jimp which normalizes the colors of an image by computing a histogram.

Syntax:

normalize(cb)

Parameter:

• cb – This is an optional parameter that is invoked when compilation is complete.

Input Images:

Setup Environment :

npm init -y

Install Dependencies : 

npm install jimp

Example 1: In this example, we will see the use of normalize().

javascript

// npm install --save jimp
// import jimp library to the environment
const Jimp = require('jimp');

// User-Defined Function to read the images
async function main() {
    const image = await Jimp.read
        ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185307/gfg28.png');
    // normalize Function
    image.normalize()
        .write('normalize1.png');
}

main();
console.log("Image Processing Completed");

Output:

Example 2: With mode and cb (optional parameters)

javascript

// npm install --save jimp
// import jimp library to the environment
const Jimp = require('jimp');

// User-Defined Function to read the images
async function main() {
    const image = await Jimp.read
        ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png');
    // Normalize Function having callback function
    image.normalize(function (err) {
        if (err) throw err;
    })
        .write('normalize2.png');
}

main();
console.log("Image Processing Completed");

Output:

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