You are absolutely correct, Lee. The concept of bump maps is well known in most 3D applications and is an inverted gray scale image where different shades of gray represents different "altitudes". Poser 4 without Pro Pack will only accept .bum files as bump maps, but they can be converted frmm other picture formats with the method described above. The disadvantage with .bum, however, is the file size, they easily end up in two-digit Mb size...