JPEGcore

Pure JavaScript JPEG encoder/decoder/transform library.

Repository: Streetblock/JPEGcore

Highlights

• Baseline JPEG decode/encode in plain JavaScript
• Progressive JPEG decode path improved and validated
• Utilities for analysis and image transforms
• Works in browser and Node.js
• jpeg-js compatible decoder wrapper: JpegCORE.JpegJsCompat.decode(...)

Install

npm install jpegcore

Usage (Node)

const JpegCORE = require("jpegcore");

jpeg-js Decoder Compatibility

const JpegCORE = require("jpegcore");

const decoded = await JpegCORE.JpegJsCompat.decode(inputBuffer, {
  useTArray: true,
  formatAsRGBA: true
});

console.log(decoded.width, decoded.height, decoded.data.length);

decode(...) returns the same shape as jpeg-js: { data, width, height }.

Performance Note

In a local benchmark with 8 images, 30 rounds and 3 warmups,
JpegCORE.JpegJsCompat.decode reached about 7.839 MPix/s vs 6.163 MPix/s for jpeg-js.decode
(about 27.18% faster in that setup).

Usage (Browser)

<script src="./JPEGcore.js"></script>
<script>
  // window.JpegCORE is available
</script>

Development

Run smoke test:

npm test

Run local compare test (against jpeg-js reference in ../Referenz):

node dev/dev-compare.js

Project Structure

• JPEGcore.js: main library
• benchmarks/: benchmark HTML and helpers
• tests/: automated smoke test
• dev/: local debug/compare tooling (for development)

Copyright (c) David Block