If you would like to have dynamic images on your site, the server where you host it needs to have the suitable software for this. As an alternative to using static images with a fixed size, you can have thumbnails and automatically resized images dependant upon the device a visitor uses or you could even flip and invert images via a script app. All these things are feasible with ImageMagick and GD library - two pieces of software that could be set up on a web server and which work with a large amount of widespread scripting languages such as: Perl, Python and PHP. Thus, you may use images with any web-based app you want, irrespective of the language it was developed with - a custom-made Perl script or a PHP one. The two libraries will allow you to work with over one hundred different image formats like GIF, PNG, TIFF, JPEG, etc.