I’ve tried to export a pdf with a scanned cave plan image overlying a scanned surface image.

I can get one or the other but not both.

I can get surveyed and ‘scrapped’ drawings to overlie scanned surface images.

I have used the following statement in my layouts;

  surface-opacity 10  # tried values from 10 to 70

  surface bottom #top/bottom/off

What I have found is that the opacity affects both the surface image and the cave plan image, with the effect that the surface always obliterates cave image.

I can live with this, but am interested if there is a work around.

Bruce