ZBrushCentral

Beginner user, question on BasRelief result

Hi Community,

Finally putting in some time and learning into ZBrush, after using Mudbox and 3DCoat for years.

I’ve watched some videos on BasRelief and have managed to produce a first decent result, however, I have a issue from my result that is not addressed or produced in any of the tutorial videos.

I’m getting a convex bas relief result, on my plane (thick box)

How can I get the BasRelief (from a 3D model, using Alpha Channel, Make BasRelief)
where it’s ‘flat’ against the background plane or cube?

thanks