it's because we typically fill at a higher resolution to try to preserve
as much of the surface topology as we can. Try using the -r flag to
change the resolution (e.g. -r 1 should keep the dimensions)
On Sat, 28 Oct
2017, Fereshte wrote:

> Dear Experts When I use " mris_fill" to fill inside a surface; the output volume dimension increases from
> 256 to such a huge number ( 700 or so). I'm not sure what the case is. I'd appreciate your help with it. 
> Regards
>
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