[Freesurfer] mri_surfcluster problem

Hi Freesurfer experts, I just want to try cluster level threshold by cluster size, but not by mc simulation. So I tried the command like : mri_surfcluster --in sig.nii.gz --subject fsaverage --hemi lh --annot aparc --sign pos --minarea 50 --sum area50.pos.cluster.summary --o area50.pos.cluster.nii.gz --thmin 1.3 However, I found that the command did not set the non-cluster vertices to zero.

The help of mri_surfcluster says that this command currently only supports paint (or w) format for input and output. I converted the sig.nii.gz to sig.w using mri_surf2surf --s fsaverage --hemi lh --sval sig.nii.gz --tval sig.w --trg_type paint. But command mri_surfcluster could not read the paint file.

Could anyone help me? Thanks! Zhiwei