Node | Jimp | contrast Last Updated : 03 Apr, 2023 Improve Improve Like Article Like Save Share Report 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 ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185307/gfg28.png'); // 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 ('https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png'); // 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 Like Article Suggest improvement Next Node Jimp | invert Share your thoughts in the comments Add Your Comment Please Login to comment...