I guess I am not entirely sure what the contrast properties of orig.mgz are. After looking at the recon-all DevTable I don't see anything that explicitly mentions any intensity normalization occurring before this point so I imagine it would work. I guess I will just ask you for your suggestion. For this particular task I would like the grayscale image to be as close to the original dicom images as possible with perhaps the one exception of reslicing. Jared