If you want to have dynamic images on your site, the machine where you host it needs to have the suitable software for that. As opposed to using static images with a fixed size, you can have thumbnails and automatically resized images depending on the device a site visitor uses or you may even flip and invert images via a script app. All these things are possible through ImageMagick and GD library - 2 pieces of software which can be set up on a server and that work with a large amount of frequently used scripting languages including: Perl, Python and PHP. In this way, you could use images with any web-based app that you would like, no matter what language it was designed with - a custom-made Perl script or a PHP one. The two libraries shall allow you to work with more than a hundred different image formats such as GIF, PNG, TIFF, JPEG, and so on.