FWIW, those screenshots look fine to me, so I'd double-check that your monitor's set up correctly (check the monitor's and OS's gamma settings, the brightness/contrast settings, etc) so the screenshots look alright.
Otherwise, in openmw.cfg is the light settings:
Code: Select all
fallback=LightAttenuation_UseConstant,0
fallback=LightAttenuation_ConstantValue,0.0
fallback=LightAttenuation_UseLinear,1
fallback=LightAttenuation_LinearMethod,1
fallback=LightAttenuation_LinearValue,3.0
fallback=LightAttenuation_LinearRadiusMult,1.0
fallback=LightAttenuation_UseQuadratic,0
fallback=LightAttenuation_QuadraticMethod,2
fallback=LightAttenuation_QuadraticValue,16.0
fallback=LightAttenuation_QuadraticRadiusMult,1.0
fallback=LightAttenuation_OutQuadInLin,0
I don't quite remember exactly what they all do, or how to change it to generally brighten up the image.