Image files that employ JPG compression are commonly called 'JPG files' and are stored in variants of the JIF image format. A thumbnail, a smaller JPEG file for quick viewing, and the sensor image data. The structure of RAW files, including the ISO standard RAW image format ISO 12234-2, follows a common pattern - a short header, camera sensor metadata, image metadata such as exposure settings, camera, and lens model, date, and sometimes the location. JPG typically achieves 10:1 compression with little perceptible loss in image quality. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPG is a commonly used method of lossy compression for digital images, particularly those produced by digital photography. RAW image formats are intended to capture as closely as possible the scene's characteristics to include light intensity and colors. RAW files are named so because they are not yet processed and ready to be printed or edited with a bitmap graphics editor. RAW file formats contain minimally processed data from the digital camera's image sensor - the metadata includes information about the lens, the settings, the camera's identification, and other data. NEF, otherwise known as the Nikon Electronic Format, is Nikon's RAW file format.