Use the
Create Bitmap Layer
button to create a new bitmap layer containing a greyscale image of the active relief layer.
To create a greyscale bitmap layer from the active relief layer:
beside the
Front Relief or
Back Relief item to display either the front or back relief layer stack.
below the splitter bar.
A new bitmap layer containing the greyscale image is created above the currently selected bitmap layer in its stack. The new bitmap layer is named after the relief layer it was created from and is selected by default.