Can't get the Post Processing Stack color grading to work, get night vision green

Hi. Like the title says, I can't get color grading to work in VR/Vive. I've set the texture formats to RGBAHalf, but no luck. Any ideas?

 

There's actually a free asset, created by the devs of PRISM, that lets you achieve a night vision effect:
https://www.assetstore.unity3d.com/en/#!/content/43423

It needs Deferred Rendering to work, thought...