Look at the 4 pictures, let's call them A, B, C, D from left to right. A is the original template (a huge black hole inside a flat white area), B is what P3 and P4 convert it into a .bum. If you open B in Photoshop and convert it into grayscale, it will look like C - and this is *very* different to A. Instead of a deep "hole" in a high area, both inside and outside is on the same level, instead you get some sort of circle shape that goes both upside and downside the gray plane (darker is a hole, lighter is a hill). Template C would convert to D with P3/4 and this is exactly how PPP will see it as well, if you make the .cr2 to point to C. If this black hole of A is a detail that needs to be seen on a Poser surface, then using C instead will completely spoil it.