cross-platform raw image processing program
RawTherapee is a powerful, cross-platform raw photo
processing program, released as libre software under
the GNU General Public License Version 3. It is written
mostly in C++ using a GTK+ front-end. It uses a patched
version of dcraw for reading raw files, with an in-house
solution which adds the highest quality support for certain
camera models unsupported by dcraw and enhances the accuracy
of certain raw files already supported by dcraw.
It is notable for the advanced control it gives
the user over the demosaicing and development process.
After installation, you should give the application additional permissions:
sudo snap connect rawtherapee:removable-media