How to fix blitz gamma ?

@Ross C

I've noticed that setting the gamma to 0,0,0, on any computer, gives good results.

I'll try.

I had different results with several graphic card. It seems to be not a Blitz bug.
I'll add a gamma brightness control.

@DrakeX
Sorry, I can't take a screenshot of this visual glitch.
It's such a pity. :/