Use this menu option to create a greyscale image of the active relief layer or the composite relief. A greyscale is an image in which the only colours are shades of grey.
A greyscale image is useful for identifying areas of a model to which you want to add texture, since the entire relief is painted in a single colour by default.
To display a greyscale preview of the composite relief:
The greyscale image is created on a new bitmap layer at the top of the layer stack under the Bitmap Layers item in the Project Tree. The bitmap layer is named Greyscale by default.