My Darktable tests continue. This image of a hole in Elephant Rock was developed from NEF RAW using the win64 version of Darktable. No further tweaks were applied except for converting the local 16-bit tiff file to jpeg and insuring the aspect ratio is 2:3. My first impressions of Darktable were not favorable but I've learned to step back and keep plugging away. The program has some nice image categorization features and the RAW developer is competitive with Lightroom, RawTherapee, Affinity Photo, and others. The metadata editor is still no match for Lightroom; I still have to insert long captions using either EXIFTOOL, Lightroom or Thumbsplus. Never depend on one program for anything that matters!