   screen darkness
  My aplication must to function into a darkly environment. It meens that the screen brightness is painfull for the eyes. If you came inside from light to this darkly environment is also damage for eyes, until you get use with the screen brightness. It would help a lot if I can reduce the brightness so that much to the complete screen darkness. The brightness seting with gamma ramp between 0-255 wouldn't help me so much. At 0 value the screen is still brightness.The rezult I hope to obtain is similar with seting in 0 of the monitor's parameters ( Brightness, Contrast and RGB). Is it possible to obtain such a rezult? Is there any way to set the monitor's brightness, contrast and RGB helping with a software aplication and to obtain a black screen?Thenk you all.Robert   
  Many astronomy applications offer a monochromatic red-on-black mode so as not to interfere with night vision. Maybe that's what you want to do?