Quote Originally Posted by Jkaen View Post
Does anybody (RobA?) know if there is a similar approach that can be used in GIMP?
I know RobA has posted a tutorial about using Inkscape to get the tapered river shape and then importing that into GIMP and since Inkscape is free, that might work for you. I ended up just breaking down and getting a tablet and it was the best descision I have made when it comes to making maps.