If you would want to have dynamic images on your website, the web server in which you host it needs to have the correct software for this. As an alternative to using static images with a fixed size, you may have thumbnails and automatically resized images in accordance with the device a visitor uses or you could even flip and invert images through a script app. All these things are feasible with ImageMagick and GD library - 2 pieces of software which can be set up on a server and which work with a lot of frequently used scripting languages including: Perl, Python and PHP. Thus, you may use images with any web-based application you'd like, regardless what language it was developed with - a custom-made Perl script or a PHP one. The two libraries shall allow you to work with more than one hundred different image formats like GIF, PNG, TIFF, JPEG, etc.