Actions Technical Details A DNG file contains a JPEG preview, with metadata and data for the one main image. File extension.dng Category Description Adobe developed the Digital Negative format (DNG) as an open lossless RAW image file because they wanted to ensure that the DNG format would satisfy the following objectives (that they felt the RAW file format would not): digital image preservation (sometimes known as archiving), easy and/or comprehensive exploitation by software developers, in-camera use by camera manufacturers and multi-vendor interoperability.
