Integration of pngquant library

The pngquant library is used to lossy compress PNG images (https://pngquant.org/). The gain can be significant (often around 70% of the file size) without losing noticeable quality for most images.

This extension integrates pngquant into TYPO3 and provides the following functionalities :

• TYPO3 processed PNG images are automatically compressed
• Uploaded images can be automatically compressed, or kept as masters
• Basic options of pngquand are available (Disable Floyd-Steinberg dithering, Speed/quality trade-off, Quality, Workaround for IE6)

Contents

• Integration of pngquant library
  • Project info and releases
• Setup
• Options
• Warning
• Debug

Project info and releases

Home page of the project: https://github.com/morinfa/pngquant

Stable version: http://typo3.org/extensions/repository/view/pngquant

Setup

1. Download and install pngquant command-line tool from https://pngquant.org/
2. Install and activate extension pngquant
3. Configure the extension with the executable path of pngquand (e.g. /usr/bin/pngquant)

Options

• basic.executable : Full path to pngquant executable. Default /usr/local/bin/pngquant
• basic.keepOriginal : If set, uploaded images will never be overwritten by pngquant (i.e. only processed images will be converted). Default 1
• basic.nofs : Disable Floyd-Steinberg dithering. Default 0
• basic.speed : Speed/quality trade-off. Default 3
• basic.quality : Don't save below min, use less colors below max (0-100).
• basic.iebug : Workaround for IE6. Default 0

Warning

If you unset the extension option basic.keepOriginal, all your PNG images will be automatically compressed at upload, and the original file will not be kept.

Debug

All errors are logged using TYPO3 logging system. By default messages are logged in typo3temp/logs/typo3.log.