afni.nimh.nih.gov

Hi afni expert
In these days ,I tried to save the mask of activated area from afni GUI as ROI. I wonder if it like the mask acquired from other ways which the voxel inside the mask is "1" and the voxel outside the mask is "0", because I found something strange when I use this mask to render. If it is not , how can I do to make it ---make the voxel inside the mask is "1"
Thanks