I have a hill-shading that I made using
gdaldem hillshade which is already pretty good. I used the option
-alt 60 to get nice contrast, but the problem is, that with lowering the light-source, also parts in the valley that are quite flat, are not really bright (white).
How could I improve that? I've seen that
gdaldem hillshade doesn't have many options.
What other program could I use to improve that? I'd like to say for example: Everything below 20% incline should be a bit lighter.