Preview employs Apple's implementation of Adobe's PDF specification, and makes significant use of Apple's Cocoagraphical user interface, Quartz graphics layer, and QuickTime image codec. Preview can open the following file types:
This gives users the ability to open a wide variety of popular and rarer image files straight out of the box. Preview offers basic image correction tools, cropping and rotation tools and annotation tools for PDF and TIFF documents. In addition, it offers keyword tools for image and PDF files. Preview can also convert between image formats; it can export to BMP, JP2, JPEG, PDF, PICT, PNG, SGI, TGA, and TIFF.