Node Jimp | Color grayscale

Introduction

The

grayscale

modifier is an inbuilt color modifier in Nodejs | Jimp which desaturate an image color into grayscale depending on a given amount, from 0 to 100.

Syntax:

image.color([
  { apply: 'grayscale', params: [value] }
]);

Parameter:

• value – This parameter stores the amount of grayscale to apply. It takes values from 0 – 100.

Input Images:

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
('https://media.geeksforgeeks.org/wp-content/uploads/20190328185307/gfg28.png');
// color function having grayscale modifier
  image.color([{apply:'grayscale', params: [50]}])
  .write('grayscale1.png');
} 

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

Output:

Example 2: 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
('https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png');
// color function having grayscale modifier
  image.color([{apply:'grayscale', params: [50]}], function(err){
    if (err) throw err;
  })
  .write('grayscale2.png');
}

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

Output:

Reference:

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