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(
// 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(
// 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