Terrain coloring

I am having problems with coloring the terrain. I have gotten the idea of selecting parts of the terrain and leading them to a colorizer. However I did not figure out how to 1) connect the colororing to the terrain = displaying it and 2) exporting the color as a file.

The manual in 7.3 is a bit vague.

Any suggestion?

This is how it looks sofar:

maybe like that

That worked. However may I get an example of color generators? The colorize limits it a bit to 2 colors

you can use colorize or basic coverage and use natural output for use with it for create terrain color, many ways are open with WM2