QPixmap and Opacity and Transparency



  • Hi,
    I want to know how to set the transparency and opacity of a pixmap. for example I want to set the opacity and transparency of a cover art to 50% and amke it a QListView's background image
    Can anyone tell me how to do this?



  • Hi @shahriar25 ,

    Try this,

    setAttribute(Qt::WA_TranslucentBackground, true);
    setWindowOpacity(0.5);



  • Hi @Ni-Sumi
    Where sohuld I do this? to the main window? to the listview?



  • Hi @shahriar25 ,

    It is some thing like this,

    QPixmap input("YourImage.png");
    QImage image(input.size(), QImage::Format_ARGB32_Premultiplied); //Image with given size and format.
    image.fill(Qt::transparent); //fills with transparent
    QPainter p(&image);
    p.setOpacity(0.2); // set opacity from 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.
    p.drawPixmap(0, 0, input); // given pixmap into the paint device.
    p.end();


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