Right click on the Fallout 2 executable in Windows Explorer and select the 'Compatibility' tab. Check off:
[/] Run this program in compatibility mode for (Windows XP SP3)
[/] Run in 256 colours
[/] Run in 640x480
I cant find a compatibility tab
Are you looking on file exporer or in the game explorer?
The game explorer not show the properties. You need to open in the windows explorer the location in that you instaled the game, find the fallout2.exe file, right click it and select the compatibility tab.
Elsewhere I'm not have the color glich bug with the gog version.