JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved. Commercial Photography Technique - The Benefits of Shooting in RAW.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. RAW image formats are intended to capture as closely as possible the characteristics of the scene to include light intensity and colours. RAW files are named so because they are not yet processed and therefore are not ready to be printed or edited with a bitmap graphics editor. RAW file formats contain minimally processed data from the image sensor of the digital camera - 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.
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