If you would want to have dynamic images on your website, the web server in which you host it needs to have the proper software for this. Rather than using static images with a fixed size, you can have thumbnails and automatically resized images in accordance with the device a website visitor uses or you could even flip and invert images through a script application. All these things are feasible via ImageMagick and GD library - two pieces of software which can be set up on a web server and which work with a large amount of frequently used scripting languages such as: Perl, Python and PHP. That way, you can use images with any web-based app you'd like, regardless what language it was designed with - a custom-made Perl script or a PHP one. The two libraries will allow you to work with more than a hundred different image formats like GIF, PNG, TIFF, JPEG, etcetera.