Node Jimp | opacity
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 the image is made opaque. It has a range of 0 to 1. 1 will turn the image completely transparent.
- cb: This is an optional parameter that is invoked when compilation is complete.
Input Images:
Setup Environment:
npm init -y
Install Dependencies:
npm install jimp
Example 1: In this example, we will see the use of opacity().
javascript
// npm install --save jimp // import jimp library to the environment const Jimp = require( 'jimp' ); // User-Defined Function to read the images async function main() { const image = await Jimp.read( 'https://media.w3wiki.net/wp-content/uploads/20190328185307/gfg28.png' ); // opacity function image.opacity(.3) .write( 'opacity1.png' ); } main(); console.log( "Image Processing Completed" ); |
Output:
javascript
// npm install --save jimp // import jimp library to the environment const Jimp = require( 'jimp' ); // User-Defined Function to read the images async function main() { const image = await Jimp.read( 'https://media.w3wiki.net/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" ); |
Output:
Reference: https://www.npmjs.com/package/jimp
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