reset the Palette of my QWidget

[sattu]

Hi everyone,

For setting an image as the background image of my QWidget I am using the following code-

this->setAutoFillBackground(true);
QPalette palette = this->palette();
palette.setBrush(this->backgroundRole(), QBrush(QImage("MyImage.jpg")));
this->setPalette(palette);

this->setAutoFillBackground(true);
QPalette palette = this->palette();
palette.setBrush(this->backgroundRole(), QBrush(QImage("MyImage.jpg")));
this->setPalette(palette);

To copy to clipboard, switch view to plain text mode 

Now I want to reset my Palette and make my QWidget appear completely Black. How do I do that?
I tried using

QPixMap and QPixMap::fill(Qt::Black)

and then setting this PixMap to my Palette, but it didn't work