260f542b__to_Good_Practice__RasterImg_2__Recommendations
[Format] .dng [Properties/Technologies] Adobe Digital Negative format, an open format developed by Adobe. [Description] Based on (and compliant with) the TIFF/EP format, DNG is an openly documented archival format for the storage of raw files generated by digital cameras. Adobe developed DNG in the hope that it will become a single raw processing solution that enables a more efficient workflow when handling raw files from multiple camera models and manufacturers (A free converter to convert existing RAW image formats to DNG can be downloaded from Adobe's website[5]). The DNG format is able to read all image tagging (EXIF & IPTC) from the original RAW file and store these in the DNG image and, in addition, supports other metadata to be embedded via XMP[6]. [Recommendations] 
DNG is suitable for the long-term storage of image data.
Guides to Good Practice: RasterImg_2
Recommendations