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:
Setup Environment :
npm init -y
Install Dependencies :
npm install jimp
Example 1:
javascript
// npm install --save jimp// import jimp library to the environmentvar Jimp = require('jimp');// User-Defined Function to read the imagesasync function main() { const image = await Jimp.read// opacity function image.opacity(.3) .write('opacity1.png');}main(); console.log("Image Processing Completed"); |
Output:
Example 2: With cb (optional parameters)
javascript
// npm install --save jimp// import jimp library to the environmentvar Jimp = require('jimp');// User-Defined Function to read the imagesasync 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"); |
Output:
Reference: https://www.npmjs.com/package/jimp
