Sorry, this is a misunderstanding. I did not try to change/edit/repair anything, I just showed that there is no need to repair anything for my own copy of Poser. gillan seems to get his #4 out of his #1, and his #4 indeed is invalid. There is no wonder that he experiences problems with it, because it is some sort of "M.C.Escher" paradox - there is no grayscale template in existance that could/should create his #4. However, my copy of Poser takes the same #1 and creates my #2 - which is perfectly valid, and obviously very different to gillan's #4. If gillan takes his #4 and inverts the red channel, he ends up with his #5, which is a valid bumpmap - however it is not the valid one that should be made out of #1 - it is the valid bumpmap that normally gets created out of my #3. So the facts are: - my (Mac) Poser creates valid bumpmaps - gillan's (PC) Poser creates a damaged conversion, for whatever reason The questions are: - is every PC Poser converting the wrong way - are there Mac Poser's who also create damaged conversions. Could people check it? Please create a black circle on white background (like both our #1's) and let Poser convert it. Does the result look like my #2, or like gillan's #4?