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 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" ); |
Output:
Example 2: With 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 // 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