ImageMagick and GD are 2 of the most widely used graphic software libraries nowadays. They make the dynamic creation and editing of images and graphs on a website feasible, so they ought to be set up on a web server if you host your internet sites on it and you want to have something different than static images with fixed dimensions. If ImageMagick and GD are set up, you'll be able to edit any image in many different ways - create thumbnails, change the colors, flip it, blur it, etc. Naturally, these adjustments are possible if the script app which you employ on your site permits you to perform such things. The 2 libraries could be used with different website development languages - PHP, Python, Perl, etc., and support over 100 widely used image formats that you'll be able to work with - PNG, PSD, JPEG, TIFF, GIF and many more.