There was a thread over in the nwn1 forums on post process injection of video shaders and using newer versions of directX.
To test whether post processing works with nwn2, I checked out a post processor for Skyrim (this one: http://www.nexusmods...yrim/mods/131/?), and followed the links to the original code (https://www.assembla...nject/documents).
I downloaded the code and ran it on nwn2 and took some screenshots. I cranked up some settings as I was just testing if the code visibly did anything with nwn2. As you can see there is a visible difference (looking better wasn't the point, just checking whether it did anything).
Menu before:

Menu after:

Game before (Storm of Zehir opening aboard ship):

Game after (Storm of Zehir opening aboard ship):






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