Hello all!

So I have drawn my map on plain white paper using black permanent markers. I then scan the map in and open it as a png in Gimp. What I now want to do is turn all of the white transparent so that I can start colouring it.

Whatever I do I end up either leaving a white border around all of the black lines, or losing some of the black.

I’m sure there must be a simple way of doing this but for the life of me I can’t figure it out.

Any help would be most gratefully received!