Do it with the GIMPOverview of FeaturesLayersAlphaDemo 1

2.7.1.1. Demo 1

Demo

  1. Generate an image with <Toolbox> Xtns Script-Fu Patterns "3D Truchet" .
  2. Duplicate the layer using <Layers> Duplicate Layer .
  3. Render a nice gradient on the lower layer.
  4. Generate an alpha on the upper layer by using <Layers> "Add Layer Mask..." .
  5. Select the paintbrush tool and paint black strokes on the alpha of the upper layer.
  6. Switch to a grey colour and paint grey strokes.
  7. Finalize the Layer's Mask using <Layers> "Apply Layer Mask"

Written by Shlomi Fish