Here is a more zoomed out portion of the map. It lost a little bit of quality because of scaling(the actual image is something like 9k pixels in both directions), but it shouldn't really matter. For all of these gradient-like river lines I need to shift the middle in the same direction.
This is a dune edge map. It's stored as a grayscale. It defines where dune edges are, and how steep they are. It's in prototyping stage, so much is still not done(hence the lines are all the same width). What I do with this is load it into a terrain engine, alongside other maps, and out comes a desert.
The problem I'm solving is that the dune sides described by such a map are equally steep on either side(the steepness is described by the gradient). Dunes are a result of wind piling up sand on one side so one side is usually smoother than the other. As a concept it works when I manually edit some small parts of it, but it's pretty terrible to do manually for the whole thing. Not only is it a whole lot of work, but since it's manual I end up with errors introduced by hand. Besides, since this is a work in progress sort of thing I constantly discard and generate improved map versions and end up going through the same processes many times.
From the looks of it, it doesn't seem like I can cheat my way out of this one, so I guess I'll have to write myself a plugin that displaces stuff based on the colour intensity.