Symphony Extension for on the fly image manipulation
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JIT Image Manipulation

"Just in time" image manipulation for Symphony. It is part of the Symphony core download package.


A simple way to manipulate images on the fly via the URL. Supports caching, image quality settings and loading of offsite images.


Information about installing and updating extensions can be found in the Symphony documentation at


Due to some .htaccess changes in Symphony 2.0.6+, it is recommended that you edit your core Symphony .htaccess to remove anything before 'extensions/' in the JIT rewrite. It should look like the following regardless of where you installed Symphony:

RewriteRule ^image\/(.+\.(jpg|gif|jpeg|png|bmp))$ extensions/jit_image_manipulation/lib/image.php?param=$1 [L,NC]

It is not absolutely necessary to do this, but may prevent problems with future releases.



The image manipulation is controlled via the URL, e. g.:

<img src="{$root}/image/2/80/80/5{image/@path}/{image/filename}" />

The extension accepts four nummeric settings for the manipulation:

  1. mode
  2. width
  3. height
  4. reference position (for cropping only)

There are four possible modes:

  • 0 none
  • 1 resize
  • 2 resize and crop (used in the example)
  • 3 crop

If you're using mode 2 or 3 for image cropping you need to specify the reference position:

| 1 | 2 | 3 |
| 4 | 5 | 6 |
| 7 | 8 | 9 |

Trusted Sites

In order pull images from external sources, you must set up a white-list of trusted sites. To do this, goto "System > Preferences" and add rules to the "JIT Image Manipulation" rules textarea. To match anything use a single asterisk (*).

Change Log

Version 1.09

  • Sending ETag header with response
  • Added support for HTTP_IF_MODIFIED_SINCE and HTTP_IF_NONE_MATCH request headers, which will mean a 304 Not Modified header can be set (Thanks to Nick Dunn for helping on this one)
  • Added Portuguese and Italian translations (Thanks to Rainer Borene & Simone Economo for those)

Version 1.08

  • Added French localisation
  • Adjusted German localisation
  • Fixed a Symphony 2.0.7RC2 compatibility issue.

Version 1.07

  • Added localisation files for Dutch, German, Portuguese (Brazil) and Russian
  • trusted() will look for the jit-trusted-sites before attempting to return its contents. This prevents warnings from showing up in the logs.

Version 1.06

  • Code responsible for .htaccess update will no longer try to append the rewrite base to for path to extensions folder

Version 1.05

  • Fixed bug introduced by usage of the imageAntiAlias() function
  • Errors and warnings are logged in the main Symphony log
  • A dump of internal params are logged in addition to any errors

Version 1.04

  • Adding support for alpha masked images.

Version 1.03

  • Minor changes to how DOCROOT is determined

Version 1.02

  • Disabling extension will remove rule from .htaccess

Version 1.01

  • Updated to work with 2.0.2 config changes