If you would like to have dynamic images on your site, the machine in which you host it should have the correct software for this. Instead of using static images with a fixed size, you could have thumbnails and automatically resized images dependant upon the device a site visitor uses or you may even flip and invert images via a script app. All of these things are feasible with ImageMagick and GD library - 2 pieces of software that could be installed on a server and which work with a great number of widely used scripting languages like: Perl, Python and PHP. That way, you can use images with any web-based app you want, no matter what language it was developed with - a custom-made Perl script or a PHP one. The 2 libraries will permit you to work with more than a hundred different image formats such as GIF, PNG, TIFF, JPEG, and so forth.