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:

filter_none

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brightness_4
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
// 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)

filter_none

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brightness_4
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
// 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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