ImageMagick and GD are two of the most popular graphic software libraries available on the market. They make the dynamic creation and editing of images and graphs on an internet site possible, so they need to be installed on a web server if you host your internet sites on it and you would like to have something different than static images with fixed dimensions. If ImageMagick and GD are set up, you will be able to edit any image in a variety of ways - generate thumbnails, change the colors, flip it, blur it, and so forth. Needless to say, these changes are possible if the script app which you employ on your internet site permits you to do such things. The two libraries can be used with different programming languages - PHP, Python, Perl, and so forth., and support more than one hundred widely used image formats which you shall be able to work with - PNG, PSD, JPEG, TIFF, GIF and many more.