In this quick tutorial, I will show you how to completely disable Tonemapper without using PostProcess

To do this, just open the DefaultEngine.ini file (in the [PROJECT_NAME]/Config folder) and add the following lines to [/Script/Engine.RendererSettings] section:

r.TonemapperGamma = 0
r.TonemapperFilm = 0
r.Tonemapper.Quality = 0
r.ToneCurveAmount = 0
r.Mobile.TonemapperFilm = 0
r.MobileTonemapperUpscale = 0
r.EyeAdaptationQuality = 0
r.EyeAdaptation.ExponentialTransitionDistance = 0

You can also write the same to the engine’s command line, but I recommend to directly add these lines to a file since it’s more convenient and will always work.