Hi Katoran

Dave and Papu are correct, but as you point out, the result is not exactly the same as the original bumpmap as the image has been converted to generate a directional information from the relief data in the bumpmap.

Personally I wouldn't worry too much about conversion, the jpg encoding may save you some space, but not much when you compare it with the size of all the other poser type files, and jpg encoding is lossy, which means a loss of some quality when you store textures and bumpmaps.

In terms of memory usage when these maps are loaded, poser expands the entire image to original size anyway, so there is no gain from storing the images on disk as jpgs.

Bill