This is darktable 2.6.2 with minimal processing:
- turn Base Curve off
- set Exposure to +1.2 stops (guessed at by assuming the hill in the centre should be about a mid-tone)
- no ICC profile, just using the built in matrix
- keep the white balance on “Camera”
You get the same (I think) results in RawTherapee using the Neutral processing profile and a +1.2 exposure adjustment.
