Nikon provides 2 free programs for it's NEF files: Capture NX-D and
ViewNX-i. I use them to import D810 photos and to make changes in post.
Output to jpg or tif and tweek in GIMP. I don't know how/if they work with
Ubuntu. Worth a look.
"Capture NX-D is a non-destructive RAW image processing application that
utilizes a sidecar system to save adjustments for Nikon photographers
looking to edit and process Nikon .NEF or .NRW files. By using a sidecar
file, instead of storing changes in the original file, Capture NX-D is
non-destructive. This means you can always reprocess an image without having
to undo all of your previous changes."
https://www.nikonusa.com/en/learn-and-explore/a/tips-and-techniques/nikon-capture-nx-d-software.html
.
RIck S.
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