I'm just trying to iterate which format is actually best, even for Photoshop.  My point is that .BMP is just the best quality format; becasue there is just more data, for everyone to rely on.  I realize there are size and render time issues, for people using .BMP, but for top notch work, that either needs to be taken up with yet another revamp of the .BMP format, or the hardware you use.

"Lossless" is a very loose term, considering the file has been compressed; which ultimately results in a loss of data; when compared back to the .BMP.  There are other formats known as lossless formats(I think even a %100 .JPG,) and I'm not saying these do'nt look O.K.; but that just does'nt mean they hav'nt been compressed at some point.  And then who is to say I would never need the image data that was disgarded, at some point in the future, after all of the hours I spent rendering??

I, personally, doubt very much that Poser 7 can save a .PSD as good as Photoshop CS3; so I would always(in theory) recommend exporting as a .BMP, becasue then CS3 would just have more data to to pick and choose from.

I knew about .PNG, and it's background; but think .PSD needs work within a Channel, before the background is actually clear?