Extension:VipsScaler

From MediaWiki.org
Jump to: navigation, search


MediaWiki extensions manual
Crystal Clear action run.png
VipsScaler

Release status: stable

Implementation Media
Description Allows to scale PNG and JPEG images using VIPS
Author(s) Bryan Tong Minh (Bryantalk)
MediaWiki 1.19+
Database changes No
License GNU General Public License 2.0 or later
Download
README
Parameters
  • $wgVipsCommand
  • $wgVipsOptions
Added rights

vipsscaler-test

Hooks used
BitmapHandlerTransform

BitmapHandlerCheckImageArea

Translate the VipsScaler extension if it is available at translatewiki.net

Check usage and version matrix; code metrics

Issues:

Open tasks · Report a bug

The VipsScaler 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 improves 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 $wgVipsOptions.

VIPS installation[edit | edit source]

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[edit | edit source]

$ 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[edit | edit source]

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

Configuration[edit | edit source]

$wgVipsCommand 
path to the vips command (default: vips).
$wgVipsOptions 
Options and conditions for images to be scaled with this scaler.Default settings.

Set to an array of arrays. The inner array contains a condition array, which contains a list of conditions that the image should pass for it to be scaled with vips. Conditions are mimeType, minArea, maxArea, minShrinkFactor, maxShrinkFactor. The other items in the array are options. Options available are:

  • sharpen: Set to an array with keys 'radius' and 'sigma', which are parameters to gaussian sharpen matrix.
  • preconvert: Convert the file to a .v file first, which costs some space, but saves memory on the actual downsize
  • bilinear: Use im_resize_linear instead of im_shrink
  • convolution: Apply specified convolution matrix
  • setcomment: Add an exif comment specifying the source of the file. Requires $wgExiv2Command to be set properly.