Node Jimp | Color greyscale

Last Updated : 22 Apr, 2019

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

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

Parameter:

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

Input Images:

Example 1:

// 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 greyscale modifier 
  image.color([{apply:'greyscale', params: [50]}]) 
  .write('greyscale1.png'); 
}  
  
main(); 
  console.log("Image Processing Completed"); 

Output:

Example 2: cb (optional parameters)

//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 greyscale modifier 
  image.color([{apply:'greyscale', params: [50]}], function(err){ 
    if (err) throw err; 
  }) 
  .write('greyscale2.png'); 
} 
  
main(); 
  console.log("Image Processing Completed"); 

Output:

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

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