https://github.com/peterhellberg/lossypng

Library version of the lossypng command line tool by @foobaz
https://github.com/peterhellberg/lossypng

go lossy png

Last synced: 10 months ago
JSON representation

Library version of the lossypng command line tool by @foobaz

• Host: GitHub
• URL: https://github.com/peterhellberg/lossypng
• Owner: peterhellberg
• License: unlicense
• Created: 2015-07-15T17:41:00.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2017-01-30T15:49:37.000Z (about 9 years ago)
• Last Synced: 2025-03-25T04:13:26.378Z (11 months ago)
• Topics: go, lossy, png
• Language: Go
• Homepage:
• Size: 14.6 KB
• Stars: 17
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
***Warning: This library should probably not be used just yet***

# lossypng

[![GoDoc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/peterhellberg/lossypng)

Library version of the [lossypng](https://github.com/foobaz/lossypng) command line tool.

> Shrink PNG files by applying a lossy filter

## Installation

    go get -u github.com/peterhellberg/lossypng

Feel free to copy all or parts of this package into your own codebase.

## Examples

### Original image `320 KB`

![Original image](http://assets.c7.se/lossypng/dakar-original.png)

The optimized images were encoded to PNG using a `png.Encoder{png.BestCompression}`

### Optimize(m, RGBAConversion, 10) `156 KB`

![Optimize(m, RGBAConversion, 10)](http://assets.c7.se/lossypng/dakar-rgba-10.png)

### Optimize(m, GrayscaleConversion, 10) `40 KB`

![Optimize(m, GrayscaleConversion, 10)](http://assets.c7.se/lossypng/dakar-grayscale-10.png)

## Credit

This compression technique was invented by Michael Vinther for his excellent

Windows program, [Image Analyzer](http://meesoft.logicnet.dk/Analyzer/). It

does much more than just compression. It was ported and improved by

[William MacKay](https://github.com/foobaz/lossypng).

I have just converted it into a library.

## License

All code in lossypng is public domain. You may use it however you wish.