Version: 2.3 (using KDE 4.5.5)
While krita can read many raw formats from camera makers, it can't open DNG files that are more are less "generic".
Steps to Reproduce:
Try to open a dng file, Krita opens a dialog box to select image format, but DNG is not in the list
Git commit 645e130fbc4357caa757aa4a12ea660d30e33748 by Cyrille Berger.
Committed on 12/02/2011 at 15:44.
Pushed by berger into branch 'master'.
Enable support for DNG files.
M +2 -2 krita/plugins/formats/raw/krita_raw.desktop
M +1 -1 krita/plugins/formats/raw/krita_raw_import.desktop
For older version of Krita, if you choose in the list any of the other raw format (for instance Nikon's nef) then it should open the DNG correctly.