Many digital cameras write “raw” files to memory cards, the equivalent of film exposure on a traditional camera, for the highest quality achievable. But there is no uniform specification of how such files are to be written, so raw files produced by one camera may be different from those produced by others.
Adobe set out to solve this problem by developing the DNG specification, a publicly available file format. The update addresses several industry requirements, according to Adobe, such as formalizing the concept of a “camera profile” and the ability to profile multiple cameras in a single DNG file. New metadata tags have also been defined, such as a field to indicate the integrity of the information contained in the file.