scifiguy, I don't want to brag too much... but my "GreyBump" filter *does* convert it back, and I'm terribly proud about this little thing... :-) If you look at the pictures (A, B, C from left to right): A is a snippet of a real Poser bump template, B is the .bum conversion of A, and C is the result from GreyBump applied to B. If you compare A with C than you can see some minor loss (the contrast is weaker and it is slightly blurred), but it is seriously better than nothing.