Sorry, I didn't mean to imply that the controls should be in-game : I was talking about using the GPU's display properties tab.
This usually works fine, both in windowed and fullscreen.
With spmbt, it only works in windowed mode, so in fullscreen, only the monitor's own hardware controls have any effect, and as I said, not satisfactory in this case.
Granted, not all video drivers (or even, nvidia drivers) expose the same color correction facilities, and I might be able to do more by updating, but with this ancient PC, wary of "fixing things that ain't broke"
Anyhow, thanks for taking the time to reply,
Keep up the great work,
Cheers !!