Hey guys,
We're working on the next patch for NMRiH and we'd like some help in fixing the Mac brightness issue that's plaguing some users; supposedly the game works fine for Mac users with NVIDIA gpus, but if you have an AMD/ATI graphics card the game will be extremely dark.
If you're a Mac user with an ATI/AMD graphics card, please post in this thread; one of us will contact you shortly with some instructions
EDIT: Thanks guys, we resolved the low brightness issue (sRGB reading error in the Mac specific shaders). Fix should be out in the next few days.