How to set a full background for the main widget

[ManiRon]

I am trying to set a full background image for my mainwindow but it is not fitting fully .

Like the image which i have attached . Kindly say how to set a full scaled image as a background for my mainwindow

My code :

  QPixmap bkgnd("" + QDir::currentPath() +  "./Images/9.jpg");
bkgnd = bkgnd.scaled(this->size(), Qt::IgnoreAspectRatio);
QPalette palette;
palette.setBrush(QPalette::Background, bkgnd);
this->setPalette(palette);

[Pl45m4]

@maniron

With stylesheet:

QString stylesheet = QString("QMainWindow { border-image: url(%1) 0 0 0 0 stretch }").arg(YOUR_IMG_PATH);
this->setStylesheet(stylesheet);