Make seamless edges for maps (not textures)
There are a few good threads on creating seamless textures, however I'm more looking in how I would create seamless edges without really touching too much of the rest of the image.
Let's say I have a map like:
To get it to horizontally and vertically wrap I shouldn't need to touch the middle land mass. However, all the tools I've seen seem to take into account the center far too much.
Gimp's seamless filter
and RR seamless filter
all take into account the middle of an image, making the output a radically different map. instead of just affecting the edge regions.
1. Is there any way to make just the edges seamless?
2. Are there any good links to places where I can learn specifically how to draw seamless map?