PHP is a well-known, open source scripting language which powers many of today's websites. This site as well is made with PHP. By default, it has just limited graphical capabilities when it comes to processing photographic images. Nexime is an extension for PHP which dramatically increases this capabilities.
Nexime allows for server-side image processing. With Nexime, a PHP or Zend engine programmer can very easily perform tasks like changing contrast, brightness, color saturation and add sharpness. But also special effect like sepia, emboss bump mapping, color inverse and photographic filters are just as easy to do. In fact, because Nexime is fully programmable, a programmer can add new effects and use them on the fly without reconfiguring, recompilation or restarting the server.