Destirantion Image display Trasparentley over Source Image

[wizards2020]

Hello,

I want to display Destination image transparently (about 50%) over displayed source image. I did in the following way, but I am not able to achieve.

I read two images and prepared QPixmaps for those two. I displayed first image on the screen and on MouseMoveEvent I am writing second image over first.

Can anyone help me how to display an image transparently over another?

Thanks
Wizards

void ImageView::OpenImage(QString path)
{
 
    QDir currentDir(path);
    QStringList files;
    files = currentDir.entryList(QStringList("*.jpg"));
    for(int i=0;i<files.size();i++)
    {
 
        QString fileName=path+"/"+files.at(i);
         if(i>=2)
            break;
        images[i].load(fileName);
 
    }
    m_SrcPixmap=QPixmap::fromImage(images[0]);
    m_DestPixmap=QPixmap::fromImage(images[1]);
 
    update();
}

void ImageView::OpenImage(QString path)
{

    QDir currentDir(path);
    QStringList files;
    files = currentDir.entryList(QStringList("*.jpg"));
    for(int i=0;i<files.size();i++)
    {

        QString fileName=path+"/"+files.at(i);
         if(i>=2)
            break;
        images[i].load(fileName);

    }
    m_SrcPixmap=QPixmap::fromImage(images[0]);
    m_DestPixmap=QPixmap::fromImage(images[1]);

    update();
}

To copy to clipboard, switch view to plain text mode 

void ImageView::paintEvent(QPaintEvent *event)
{
      QPainter p(this);
 
        p.drawPixmap(150,150,m_SrcPixmap.width(),m_SrcPixmap.height(),m_SrcPixmap);
 
}

void ImageView::paintEvent(QPaintEvent *event)
{
      QPainter p(this);

        p.drawPixmap(150,150,m_SrcPixmap.width(),m_SrcPixmap.height(),m_SrcPixmap);

}

To copy to clipboard, switch view to plain text mode 

void ImageView::mouseMoveEvent(QMouseEvent *me)
{
    if(me->buttons()==Qt::LeftButton)
    {
        QPainter painter(&m_SrcPixmap);
 
        painter.setCompositionMode(QPainter::CompositionMode_Overlay);
        painter.drawPixmap(me->x(),me->y(), m_DestPixmap);
 
 
        painter.end();
        update();
    }
 
}

void ImageView::mouseMoveEvent(QMouseEvent *me)
{
    if(me->buttons()==Qt::LeftButton)
    {
        QPainter painter(&m_SrcPixmap);

        painter.setCompositionMode(QPainter::CompositionMode_Overlay);
        painter.drawPixmap(me->x(),me->y(), m_DestPixmap);


        painter.end();
        update();
    }

}

To copy to clipboard, switch view to plain text mode 

[stampede]

Try with modified opacity:

QPainter painter(&m_SrcPixmap);
painter.setOpacity(0.5);
painter.drawPixmap(me->x(),me->y(), m_DestPixmap);
painter.end();

QPainter painter(&m_SrcPixmap);
painter.setOpacity(0.5);
painter.drawPixmap(me->x(),me->y(), m_DestPixmap);
painter.end();

To copy to clipboard, switch view to plain text mode