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Preview is Mac OS X's application for displaying images and Portable Document Format (PDF) documents. Like Mac OS X itself, it comes from NeXT's OPENSTEP operating system. Preview employs Apple's implementation of Adobe's PDF specification, and makes significant use of Apple's Aqua graphical user interface, Quartz graphics layer, and the ImageIO and CoreImage frameworks. Preview can open the following file types: This gives users the ability to open a wide variety of popular and rarer image files. Preview offers basic image correction tools using Core Image processing technology implemented in Mac OS X, and other features like shape extraction, color extraction, cropping, and rotation tools. Also, some features which are otherwise only available in professional PDF editing software are provided by Preview: It is possible to extract single pages out of multi-page documents (e.g. PDF files), sort pages, and drag & drop single or multiple pages between several opened multi-page documents, or into other applications, such as attaching to an opened email message. Preview can also encrypt PDF documents, and restrict their use; for example, it is possible to save an encrypted PDF so that