Changing the fog for a map is a command executed within a maps .cfg file. The input method is unlike that for light and watercolor, in the fact that it is a hexadecimal color code. To those that don't know much, or even anything about what that is, it's the 16^6 colors in the 48-bit color coding system (16,777,216 for those mathy people out there :D). If you are even more lost now than you were before reading this post, there are websites such as this one that list them for you and that can help you come up with one for your map.
:)
or you could just copy one from an official map... -__-
edit: WHALESSSSSSSSSSSSSS DAMN I SPENT TIME ON THAT.
:)
or you could just copy one from an official map... -__-
edit: WHALESSSSSSSSSSSSSS DAMN I SPENT TIME ON THAT.