Well for me at least.
It's possible to use xgamma to adjust it outside the game. I'd guess it would be possible to do the same thing from inside the game, but there is no option for it in the video menu (there is one in the Windows version or so I've heard).

We,ve just never implemented that feature. It requires the use of an extension and I'm not sure which extension is required. If it's an X extension or a glx one or what.

I think having a gamma setting inside Vendetta would do the same thing.

If you are using an nVidia card please see my post in this forum titled "Some settings for nVidia drivers on Linux".

The option you'll see there that you might want to try is "DigitalVibrance".

Hi,

you could simply create a script...

/usr/bin/vendetta-gamma:

----
#!/bin/sh
xgamma -gamma 2.000
vendetta
xgamma -gamma 1.000
----

So, when you leave the game, the gamma will be set normal

except it doesn't work for ppl with windowed mode because it still will kill their eyes while leaving vendetta open and looking at something else (such as the bugs forum or active list).
but for ppl like that you can make a perl script or something that reads errors.log and changes gamma depending on sector and station etc.