How to set image to the background of the centralWidget?

Cesar

How do i set the picture into the window background without it 'replicating' the image and filling the background with black?

Im resizing the picture and i didn't understand how to change the position where the image will be drawn:

Launcher::Launcher(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    //ui.centralWidget->setObjectName("objectName");
    //ui.centralWidget->setStyleSheet("#objectName { background-image: url(:/Launcher/cat) }");

    QPixmap bkgnd(":/Launcher/cat");
    bkgnd = bkgnd.scaled(QSize(300, 300), Qt::KeepAspectRatio);
    //bkgnd.fill(Qt::transparent);

    QPalette palette;

    palette.setBrush(QPalette::Window, bkgnd);
    //palette.setBrush(QPalette::Window, Qt::transparent);

    //this->setAttribute(Qt::WA_TranslucentBackground, true);
    //this->setStyleSheet("background: transparent;");
    //this->setAutoFillBackground(true);
    this->setPalette(palette);
}

Result:

cat.png:
https://i.imgur.com/XPhquk5.jpeg

JonB

@Cesar
I would Google qt stylesheet background-image. For example, https://forum.qt.io/topic/40151/solved-scaled-background-image-using-stylesheet may be useful. I see that, like for CSS, the default for a background image is "repeat"/"tile", meaning that a small image is repeatedly tiles to cover the whole area. You need the no-repeat, at least some parts of:

background: url(:/res/background.jpg) no-repeat center center fixed;

I am not sure about the white background shown in your imgur link and the black background shown in your Qt. I know that for GIFs you have to "tell it" which color is background in order to achieve transparency. Do you have to do the same thing for a JPEG? Googling jpeg transparent background implies to me that this is not easy? One answer at https://qr.ae/pvatpF claims:

JPEGs don’t support transparency, but PNGs and GIFs do. If you want the image to have transparent areas it needs to be converted to a PNG or GIF.

Cesar

@JonB i didn't note that Imgur converted the image to .jpeg, the original image is a png with transparency.
Is possible to use a pixmap with the stylesheet? and how do i modify the position where the image will be drawn in the background?