gamma value can not restore.

[telppa]

When I entered the system, I get the gamma value is 384.

However, none of the following 3 settings can restore the screen to the state when I entered the system.

Monitor.SetGammaRamp(384, 384, 384)
Monitor.SetGammaRamp(100, 100, 100)
Monitor.SetGammaRamp(128, 128, 128)

[telppa]

here is 4 pics to show how they looks like.

Shot by camera with the same and fixed parameters.

[jNizM]

Looks like a cap of max value of 255/256 is missing.