Removing extension of a file name in Qt

I'm using Qt to get a file name from the user:

QString fileName = QFileDialog::getOpenFileName(this,tr("Select an image file"),"d:\\",tr("Image files(*.tiff *.tif )"));

It works, but I need the file name without its extension, is it possible in Qt?? whenn I try :

QString f = QFileInfo(fileName).fileName();

f is like "filename.tif", but I want it to be "filename".