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jpeg-js

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jpeg-js

A pure javascript JPEG encoder and decoder


Version published
Weekly downloads
2.9M
decreased by-2.92%
Maintainers
6
Weekly downloads
 
Created

What is jpeg-js?

The jpeg-js npm package is a pure JavaScript JPEG encoder and decoder for node.js and browsers. It allows users to decode JPEG images into a bitmap and encode bitmaps into JPEG format. This package is useful for image processing tasks where manipulation of JPEG images is required.

What are jpeg-js's main functionalities?

Decoding JPEG images

This feature allows users to decode JPEG images into a raw image data object, which includes width, height, and an image data buffer.

const jpeg = require('jpeg-js');
const jpegData = fs.readFileSync('image.jpg');
const rawImageData = jpeg.decode(jpegData);

Encoding raw image data to JPEG

This feature allows users to encode raw image data (RGBA format) into a JPEG image. The quality of the output JPEG can be specified.

const jpeg = require('jpeg-js');
const fs = require('fs');
const frameData = Buffer.alloc(width * height * 4);
// ... populate frameData with raw RGBA image data ...
const rawImageData = { data: frameData, width: width, height: height };
const jpegImageData = jpeg.encode(rawImageData, 50); // Quality is 50 out of 100
fs.writeFileSync('new-image.jpg', jpegImageData.data);

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Package last updated on 07 Jun 2022

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