ImageMagick and GD are two of the most popular graphic software libraries out there. They make the dynamic creation and editing of images and graphs on a website doable, so they should be available on a web server if you host your websites on it and you would want to have something different than static images with fixed dimensions. If ImageMagick and GD are installed, you shall be able to edit any image in various ways - create thumbnails, change the colors, flip it, blur it, and so on. Needless to say, these changes are possible if the script application which you use on your internet site permits you to perform such things. The 2 libraries could be used with numerous web development languages - PHP, Python, Perl, etcetera., and support over 100 commonly used image formats which you will be able to work with - PNG, PSD, JPEG, TIFF, GIF and more.