Gamma correction and tonemapping

[straaljager]

Required to obtain realistic looking lighting.

Blender pioneered a tonemapping filter called "Filmic", which adds a lot of realism: https://www.blenderguru.com/tutorials/secret-ingredient-photorealism

[tribal-tec]

ospray might already have someting to fit this need: https://github.com/ospray/ospray/blob/master/ospray/fb/ToneMapperPixelOp.h

[straaljager]

Great, looks like it has an implementation of the filmic tonemapper.

[NadirRoGue]

Gamma correction and tone mapping are now implemented as part of Brayns 3.0.0 and available on master branch.