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RAW format

RAW file formats are raw data formats for capturing and storing graphics files such as those from digital cameras. They are manufacturer-specific data formats with which only files of the corresponding manufacturer cameras are represented. For example, Minolta's format is called MRW, Canon's is CR2, Nikon's is NEF, and so on.

RAW data are raw data that come directly from the image sensor of the digital camera, are uncompressed and unprocessed, and must first be interpolated. RAW formats are characterized by a wide dynamic range, which can include 10, 12, 14 and more bits of brightness dynamic range, i.e. brightness ratios from 1,024 up to 16,384 and more. In addition, RAW formats have a flat gamma curve, which implies much better dynamic range. Due to the extended dynamic range, digital photos in RAW format have better definition in bright and dark areas of the image and can be converted into high- resolution HDR photos. Since each camera manufacturer uses its own and sometimes camera-dependent RAW files, standardization is of particular interest to manufacturers and networkers. One approach to this is the DNG file format from Adobe.

Designation of the different RAW formats

Designation of the different RAW formats

RAW files can be saved, they have the advantage of having no fragments and a large color gamut. The disadvantage is that the different manufacturer-specific RAW variants lead to compatibility problems and are poorly suited for archiving, and, that uncompressed RAW images have quite a large data volume. Therefore, digital cameras use metadata formats such as Exchangeable Image File( EXIF), International Press Telecommunications Council( IPTC) and Extensible Metadata Platform(XMP). Displaying RAW data in Windows Explorer as thumbnails or for preview is only possible if the RAW files contain an embedded JPEG.

Englisch: RAW format
Updated at: 12.03.2013
#Words: 276
Links: file, raw data, graphics, digital, network element function (ATM/TMN) (NEF)
Translations: DE

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