DNG (Digital Negative)
DNG is Adobe's open raw image format designed as a universal standard for camera raw data. It embeds the raw sensor data, metadata, and an XMP sidecar in a single self-contained file, solving the problem of proprietary raw format obsolescence.
MIME Type
image/x-adobe-dng
Type
Binary
Compression
Lossless
Advantages
- + Open, documented format — no proprietary lock-in
- + Self-contained — raw data, metadata, and XMP in one file
- + Supported by Lightroom, Photoshop, and many raw processors
- + Long-term archival standard backed by Adobe
Disadvantages
- − Conversion from proprietary raw may lose maker-specific data
- − Not all camera manufacturers support DNG natively
- − Slightly larger than some proprietary compressed raws
When to Use .DNG
Use DNG for raw photo archival, when converting from proprietary raw formats, and for workflows that benefit from a single-file standard.
Technical Details
DNG files use a TIFF/EP container with raw sensor data (lossless JPEG or deflate compressed), EXIF metadata, XMP data, and optional embedded original raw files. DNG 1.6 added support for enhanced processing.
History
Adobe introduced DNG in 2004 to address the proliferation of proprietary raw formats. Apple, Google (Pixel phones), and Leica adopted DNG natively. It is based on TIFF/EP and is an open specification.