DNGspecifikaation

The DNGspecifikaation, or Digital Negative specification, is a standard developed by Adobe Systems for storing raw image data in a single, compact, and widely compatible format. Designed to replace proprietary raw file formats used by camera manufacturers, DNG specifies how image data, metadata, and ancillary files are bundled inside a ZIP-style container that conforms to the TIFF/EP structure. The specification supports modern imaging features such as embedded thumbnails, high‑dynamic‑range data, color profiles, and preview images while maintaining lossless compression for the raw sensor data.

Adobe released the first DNG specification in 2004 to provide a long‑term archival format for photographic data. The format has been refined through multiple revisions, each adding support for new camera models, raw files, and file‑level features such as multi‑frame image sets (e.g., focus‑stacked or burst sequences). DNG files remain backwards compatible with older software, and many workflow tools now natively import and export the format.

The DNGspecifikaation plays an important role in post‑processing workflows. By converting proprietary raw files to DNG, photographers can create a consistent source file across devices, reduce version fragmentation, and simplify backup strategies. Support for DNG extends beyond Adobe products; major non‑Adobe editors, operating systems, and even camera firmware sometimes provide native or optional DNG conversion. Additionally, the format’s open documentation allows third‑party developers to implement support without licensing restrictions.

Although DNG is widely supported, adoption varies. Some manufacturers still ship raw formats exclusively, and certain niche cameras or high‑end features may not be fully represented in the DNG schema. Consequently, photographers often keep original raw files alongside DNG copies to preserve manufacturer‑specific data. Nevertheless, the DNGspecifikaation remains a widely used tool for ensuring long‑term accessibility, interoperability, and archival stability of digital photography data.