[$] A preview of darktable 1.6

The darktable project recently announced the first release-candidate (RC) builds for its upcoming version 1.6 release. The new version will add a slideshow presentation tool to darktable's primary photo-editing features, plus several new image operations and support for new digital cameras. This time, several of the additions add to darktable's automatic adjustment capabilities, making the application a bit more friendly for users who are new to high-end photo editing.