Example:
vpretty -in zmap.v -pos 3.1 -neg -3.1 -out result.v -minsize 81
The output image displays all activation areas larger than 'minsize'. The parameter '-minsize' is given in units of mm^3. Example: if the spatial resolution is 3x3x3mm then a minsize of 81 corresponds to three voxels (81 = 3 x 27 = 3 x (3x3x3)).