GD extension is already built in. Unless, you are trying to do something GD doesn't support. ( Image Magick is much more extensive)
Quote:What is the GD library?
The GD library is a graphics drawing library that provides tools for manipulating image data. In Shopp, the GD library is used to process images for generating gallery preview and thumbnail size images automatically.
Quote:What is Image Magick?
ImageMagick is a robust collection of tools and libraries to read, write, and manipulate an image in many image formats including TIFF, JPEG, PNG, PDF, PhotoCD, and GIF. With ImageMagick you can create images dynamically, making it suitable for Web applications.
