change pixmap color, clip background

[Bocky]

hi

i have a pixmap from a png picture
now i want to paint all pixels of this pixmap more red or blue for example, but ignore the background
i tried to createmaskfromcolor function but it doesnt work.

with setting the opacity i get the desired effect but the white background is also drawn in red.

QColor color;
    QPixmap input=*CurrObject->getImage(TypeValues[ComboBoxType->currentIndex()]);
    QImage image(input.size(), QImage::Format_ARGB32_Premultiplied);  
    color=Qt::red;         
    image.fill(color);
    QPainter p(&image);
    p.setOpacity(0.5);
    p.drawPixmap(0,0,input);
    p.end();
    QPixmap output = QPixmap::fromImage(image);
    ui->Label2D->setPixmap(output);

QColor color;
    QPixmap input=*CurrObject->getImage(TypeValues[ComboBoxType->currentIndex()]);
    QImage image(input.size(), QImage::Format_ARGB32_Premultiplied);  
    color=Qt::red;         
    image.fill(color);
    QPainter p(&image);
    p.setOpacity(0.5);
    p.drawPixmap(0,0,input);
    p.end();
    QPixmap output = QPixmap::fromImage(image);
    ui->Label2D->setPixmap(output);

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