Ok I got the final solution

i should have resampled my data with more options
mincresample -keep_real_range -unsigned -clobber -like N3_S001.mnc 001_labels.mnc 001_labels_r.mnc

In this case niak_read_minc works as expected :). I am sorry if i created confusion among users !


I have still one question:

It is possible we get a error if we use the precision input variable  ?
e.g: [hdr,vol] = niak_read_minc(001_labels_r.mnc,'unsigned')  because 'unsigned' is not recognised by fread