# dropbox/lepton

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4,997 stars · 347 forks · C++ · Apache-2.0 · archived

## Links

- GitHub: https://github.com/dropbox/lepton
- Homepage: https://blogs.dropbox.com/tech/2016/07/lepton-image-compression-saving-22-losslessly-from-images-at-15mbs/
- awesome-repositories: https://awesome-repositories.com/repository/dropbox-lepton.md

## Topics

`compression` `compression-algorithm` `decompression` `jpeg` `lossless-compression-algorithm`

## Description

Lepton is a specialized tool and file format designed for the lossless compression and efficient storage of JPEG image data. It functions as a lossless compressor and storage optimizer that reduces file sizes without altering original pixel data, ensuring bit-perfect reconstruction of the images.

The project focuses on reducing disk space and network bandwidth requirements for digital image archives. It provides capabilities for both the compression and decompression of JPEG files to maintain high-quality image storage while minimizing the overall data footprint.

The implementation utilizes a variety of entropy encoding and data processing techniques, including arithmetic and Huffman coding, predictive modeling, and stream-based processing. It also integrates optimized array operations for the processing of large image data blocks.

## Tags

### Graphics & Multimedia

- [JPEG Lossless Compressors](https://awesome-repositories.com/f/graphics-multimedia/jpeg-image-compression/lossless-file-optimizations/jpeg-lossless-compressors.md) — Functions as a specialized tool for the lossless compression of JPEG images.
- [JPEG Format Decoders](https://awesome-repositories.com/f/graphics-multimedia/image-decoding/jpeg-format-decoders.md) — Restores compressed files to their original JPEG format without any data loss. ([source](https://cdn.jsdelivr.net/gh/dropbox/lepton@master/README.md))
- [JPEG Image Compression](https://awesome-repositories.com/f/graphics-multimedia/jpeg-image-compression.md) — Provides lossless compression for JPEG files to reduce storage and bandwidth usage. ([source](https://cdn.jsdelivr.net/gh/dropbox/lepton@master/README.md))
- [Storage Optimizers](https://awesome-repositories.com/f/graphics-multimedia/jpeg-image-compression/storage-optimizers.md) — Acts as a storage optimizer to decrease disk space and network bandwidth for image archives.
- [Lossless Compression](https://awesome-repositories.com/f/graphics-multimedia/media-processing-analysis/media-manipulation/image-processing/image-compression-tools/lossless-compression.md) — Implements image compression that allows for perfect original quality reconstruction.
- [Arithmetic Coding](https://awesome-repositories.com/f/graphics-multimedia/image-compression-standards/arithmetic-coding.md) — Implements arithmetic coding to achieve higher compression density for JPEG data.
- [Image Delta Encoding](https://awesome-repositories.com/f/graphics-multimedia/predictive-geometry-encoding/image-delta-encoding.md) — Utilizes predictive modeling to encode only the differences between predicted and actual symbol values.

### Repository Format

- [Lossless Image Formats](https://awesome-repositories.com/f/repository-format/lossless-image-formats.md) — Introduces a specialized file format for storing JPEG data more efficiently with bit-perfect reconstruction.

### Data & Databases

- [Digital Archives](https://awesome-repositories.com/f/data-databases/digital-archives.md) — Optimizes the storage of large JPEG collections while ensuring bit-perfect recovery.

### Networking & Communication

- [Network Data Compression](https://awesome-repositories.com/f/networking-communication/network-data-compression.md) — Reduces the amount of data transferred over networks by compressing JPEG images.

### Scientific & Mathematical Computing

- [Huffman Coding Implementations](https://awesome-repositories.com/f/scientific-mathematical-computing/huffman-coding-implementations.md) — Uses Huffman coding for frequency-based bit reduction in the image compression process.

### Software Engineering & Architecture

- [Arithmetic Coding Implementations](https://awesome-repositories.com/f/software-engineering-architecture/integer-arithmetic/arithmetic-coding-implementations.md) — Employs integer-based arithmetic coding to ensure precise, bit-perfect reconstruction across different hardware.