Node Jimp | opacity

Introduction
The opacity() function is an inbuilt function in Nodejs | Jimp which multiplies the opacity of each pixel by a factor between 0 and 1.

Syntax:

opacity(f, cb)

Parameter:

  • f – This parameter stores the value by which image is to make opaque. It has a range of 0 to 1. 1 will turn the image completely transparent.
  • cb – This is an optional parameter which is invoked when compilation is complete.

Input Images:



Example 1:

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code

// 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');
// opacity function
  image.opacity(.3)
  .write('opacity1.png');
}
  
main();
  console.log("Image Processing Completed");

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Output:




Example 2: With cb (optional parameters)













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// 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'); 


// opacity function using callback function 


  image.opacity(.5, function(err){ 


    if (err) throw err; 


  }) 


  .write('opacity2.png'); 


} 


  


main(); 


  console.log("Image Processing Completed"); 



















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Output:



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





    

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