Hi all, this is my first post here. I've looked through the archives for an answer to my question, but am not having any luck so far.

Essentially, I have a greyscale heightmap like this:

Screen Shot 2016-09-18 at 16.03.28.png

That I want to turn into something like this:

Europe_topography_map_en.png

I'm using GIMP, and there doesn't seem to be a straightforward way to convert the black-to-white gradient into anything else. Can anybody help?