ImageMagick and GD are software libraries that ought to be present on a web server for images to show up on a certain internet site. They permit you to perform various tasks with the images - create, flip, resize, change colors, etc. These things can certainly be performed online and in real time, so if you add a static image, for instance, the libraries make it possible for a thumbnail to show up on the internet site or for the image to be resized automatically based on the device and resolution that the site visitor is using. Both ImageMagick and GD may be employed with various web programming languages such as PHP, Perl and Python, so you don't have to stick to just one language to build your site. They work with over 100 formats, which includes the most popular ones - JPEG, GIF, TIFF, PNG, etc.