Short tutorial. 

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1) Download and install ReShade for X-Plane 11

(Just pick up x-plane.exe when installation ask about it, choose OpenGL, and say OK to download and install additional packets)

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2) Download this archive.

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3) Replace files in your X-Plane 11 root folder with files from archive. 

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4) In game, press Shift + F2, choose preset - color fullness