Hi Zein, Nope, I'm wrong, The default is to save in two files. When you provide filename: "foo.mha" MetaImageIO writes the two files: foo.mha ----> text header foo.mha.raw ----> raw binary data Sorry about the confusion. Luis ----------------------------------------------- salah wrote: > Hi Luis, > > are you sure the default is to save volumes in a single file?? > > Thanks > Zein >