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Node | Jimp | contrast

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The contrast() function is an inbuilt function in Nodejs | Jimp that adjusts the contrast of an image by a value of -1 to +1. 

Syntax: 

contrast(n, cb)

Parameter: 

  • n: This parameter stores the amount to adjust the contrast, a number between -1 and +1
  • 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: 

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
    // contrast function
    image.contrast(.4)
        .write('contrast1.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
const Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
    const image = await Jimp.read
    // contrast function using callback function
    image.posterize(.5, function (err) {
        if (err) throw err;
    })
        .write('contrast2.png');
}
 
main();
console.log("Image Processing Completed");


Output: 

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



Last Updated : 03 Apr, 2023
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