You can open raw images in GIMP using RawTherapee as a plugin.
- RawTherapee 5.3
- GIMP 2.9.6
- The RawTherapee executable must be found from the
$PATHenvironment variable. This will be the case if you installed RawTherapee system-wide.
Just open a raw file from GIMP. A RawTherapee editor window should open automatically, which you can use to tweak your raw file. When you close the window, the image gets imported into GIMP.