Hi,

First I tried to use my original mask which is a gifti with a single darray as NIFTI_INTENT_ESTIMATE that contains 0 or 1 for each vertex.

But I got it:

** DA[0] has coordsys with intent NIFTI_INTENT_ESTIMATE (should be NIFTI_INTENT_POINTSET)

MRISreadGiftiAsMRI: no overlay data found in file [filename]

So I changed darray to a new one that contains only the list of the point coordinates where my mask is equal to 1 (and use NIFTI_INTENT_POINTSET) and now I have only this error:

" MRISreadGiftiAsMRI: no overlay data found in file [filename] "

Bastien