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Node | Jimp | contrast

  • Last Updated : 22 Feb, 2021

Introduction :  The contrast() function is an inbuilt function in Nodejs | Jimp which 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 which 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
var 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
var 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
 




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