I'm making some manual segmentation changes in the brainmask.mgz and using mri_vol2vol and mri_mask commands to apply these changes to the rawavg.mgz, the output from the mri_vol2vol looks perfectly normal,and retains all changed made by me, but when I use the mri_mask command over the rawavg.mgz no segmentation seems to be donne in the final output file.