I'm having troubles with the resolution of the game on my Surface Pro 2. My computer's resolution is 1920x1080, but with the corresponding Amnesia setting, this is what I see:
This is the best it gets. The other settings are worse
In addition, when I use my mouse, the mouse on screen jumps all over the place. When I use the trackpad it works fine, but that's not a viable alternative when gaming.
Anyhow, you might mean PPI seeing as we're talking pixels, although there's often not much of a distinction. It might be a setting on your monitor, but I'm guessing this only happens to this game and nowhere else? I'm afraid I haven't edited much of this myself so I don't really know, but perhaps this can help.