Darktable is a free and open-source photography workflow application and raw developer. Rather than being a raster graphics editor such as Adobe Photoshop or GIMP, it comprises a subset of image editing operations specifically aimed at non-destructive raw photo post-production. It is primarily focused on improving a photographer’s workflow by facilitating the handling of large numbers of images. It is freely available in versions tailored for most major Linux distributions, macOS, Solaris and Windows and is released under the GNU General Public License 3 or later ……
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Darktable – Digital Darkroom
Darktable, a photography workflow application, works as the center of a photo studio. Camera can be direcetly tethered to it, bypassing the SD card tool and shooting straight into Darktable. Thereafter photos can be reviewed, non-destructive edited on filter-base and published. It’s a complete solution for a photographer.
Darktable Basic Tutorial
Editing Examples - Darktable Tutorial