Ok, I accidently did a whole map in 200dpi which bugs me because i was thinking about getting this printed for my gaming group.

If I scale it up to 300dpi does it just add in pixels and color them as it sees fit or am I better off just leaving it at 200dpi and learning the lesson?

I can't really see any difference when I scale it up but that's on my screen so I'm not sure what that would do to the printed copy.

I know we had some conversations about dpi a while back but I don't really remember anything about scaling up other than it not being such a good idea most of the time.

BTW - I'm using Gimp in case it matters (or in other words it's not vector).