The gradient map filter is definitely useful, but what would go significantly further in my opinion is an adjustment layer. When the gradient map is above your heightmap as an adjustment layer, you can paint on the heightmap and see it update in real time with the gradient mapping applied. This is h...

Try to setup this brushes that transparency couldn't be 0 Thank you so much for the tip! This has really been bugging me sense I updated to 1.72. For those who might not understand, the sliders have a min and max setting, clamps. Slide the left side (min) to the right a touch so it's min is greater...