man mincwindow (Commandes) - limit voxel values to a given range
NAME
mincwindow - limit voxel values to a given range
SYNOPSIS
mincwindow [options] in.mnc out.mnc min max [newvalue]
DESCRIPTION
mincwindow copies in.mnc to out.mnc. Each voxel value that lies within the window [min,max] is copied unmodified. If the voxel value is outside that window and newvalue is specified, then that voxel is set to newvalue. Otherwise, the voxel value is set to min if it is less than min, and to max if it is higher than max.