I often want to take my laptop out into the field for astronomical observations. This requires that my eyes be fully adapted to the darkness. Dark adaptation takes up to an hour to fully develop and is easy destroyed by looking at a non-red light. A pure red light does not affect dark adaptation.
I'd like to somehow change settings on my computer so that it emits only red light. The effect would be the equivalent of putting a red film on the monitor, which is what I'll resort to if I can't change settings.
Anyone know how to do this in Windows 7/8?