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Adobe has submitted their proprietary DNG RAW file format to the ISO as a proposed new standard. Adobe will also provide a DNG-viewing codec to view DNG files right within the Windows Vista operating system.
Some of the merits of DNG according to John Knack from Adobe:
* Converting to DNG saves disk space and eliminates the need to use separate sidecar files for raw settings. (I knocked 1.5GB off the 7GB of photos from our wedding photographer.)
* Because of these benefits, customer feedback indicates that 40% of Lightroom users are converting to DNG on import. (It's a one-click set-and-forget option that's also available in Adobe Bridge CS3.)
* DNG lets Adobe support new cameras in older versions of Camera Raw without having to constantly revise and test those versions. Photographers and use the free DNG Converter (Win | Mac) to process their proprietary raw images to DNG. The upshot is that we can spend our time building good new functionality instead of updating old software.