http://www.pubpixel.com - Now in-order to apply special effects to an image or in other words a filter to an image using PHP you will need to use PHP's imagefilter() function, which was introduced to us in PHP 5. You should also take note that the imagefilter() function is only available if PHP is compiled with the bundled version of the GD library. The GD library is basically used for dynamic image creation. The GD library is an open source code library for the dynamic creation of images by programmers. The Letters GD originally stood for "GIF Draw". But, since Unisys revoked the royalty-free license, it has informally stood for "Graphics Draw", alright that's enough info about the GD library.