Extension:VipsScaler

This extension is a wrapper around VIPS, a free image processing software. VIPS is a set of image manipulation tools specially designed for speed and low memory usage. This is useful for resizing large PNGs, and it the appearance of shrunken JPEGs.

The extension shells out to the vips binary. It can be configured to scale only certain files (for example: big PNGs) by configuring $wgVipsConditions.

The Wikimedia Foundation is testing out using it on test2.wikipedia.org, but it isn't deployed on any major WMF wikis yet.

VIPS installation
Install VIPS. It can be downloaded from http://www.vips.ecs.soton.ac.uk/.

After downloading VipsScaler, add it to your extensions/ directory, then add require_once("$IP/extensions/VipsScaler/VipsScaler.php"); If you'd like to add the Special:VipsTest test page, also add require_once("$IP/extensions/VipsScaler/VipsTest.php");

Debian / Ubuntu
$ apt-get install libvips-tools If you want to build from source have a look at upstream documentation: http://www.vips.ecs.soton.ac.uk/index.php?title=Build_on_Ubuntu

(Wikimedia has packaged and uses a more recent version for Ubuntu 12.04 at apt.wikimedia.org)

Mac OS X

 * homebrew
 * brew install vips
 * binary symlink is /usr/local/bin/vips

Configuration
$wgVipsCommand : path to the vips command (default: vips).

$wgVipsOptions : scaler conditions, to be documented.