Recording Amnesia on Mac

[deadphish755]

So i have been trying to record amnesia on my 15 inch macbook pro using quicktime screen capture program. the only problem is that the screen capture is not capturing what is actually on my screen. no matter how much i turn up the brightness on the game when i go to the playback on the video recording the brightness is really low on the game and you can't see anything. With every other game it works fine but for amnesia the brightness is so low regardless of how i view it while im playing. Does anyone know how to fix this?
- Thanx