ImageMagick and GD are 2 of the most popular graphic software libraries on the market. They make the dynamic creation and editing of images and graphs on a site possible, so they ought to be present on a server if you host your websites on it and you prefer to have something different from static images with fixed dimensions. If ImageMagick and GD are present, you shall be able to edit any image in many different ways - generate thumbnails, change the colors, flip it, blur it, etcetera. Naturally, these tweaks are feasible if the script application which you use on your internet site enables you to perform such things. The 2 libraries could be used with different web development languages - PHP, Python, Perl, and so forth., and support more than 100 frequently used image formats which you'll be able to work with - PNG, PSD, JPEG, TIFF, GIF and more.