CODEWITHSUNDEEP
qttransparencyqpixmap
Elseine
Elseine

Reputation: 761

Make a pixmap transparent for a QLabel

I have a MainWindow with a QLabel and a pixmap. I want to make it transparent (or less opaque)

I am using the following code below.

ui->label->setAttribute(Qt::WA_TranslucentBackground);
ui->label->repaint();

However it does not seem to work. The image looks the same without any changes. I also tried to use to the following statement:

    ui->label->setStyleSheet("background-color: rgba(255, 255, 255, 10);");

Unfortunately, this does not seem to work either.

Anyone knows how can I make an image transparent or make it less opaque?

Thank you for your time.

Upvotes: 5

Views: 10843

Answers (3)

antipups
antipups

Reputation: 311

You can use method fill, example:

pixmap = QPixmap(width_size_in_pixels, height_size_in_pixels)
pixmap.fill(Qt.transparent)

Upvotes: 2

Dmitry Sazonov
Dmitry Sazonov

Reputation: 8994

You can apply QGraphicsOpacityEffect to a label to adjust it's opacity.

Upvotes: 0

thuga
thuga

Reputation: 12931

If your image isn't transparent as it is and you want it to be, you can do something like this:

QLabel *l = new QLabel(this);
QImage image(":/img/myimage.png");
QPainter p;
p.begin(&image);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.fillRect(image.rect(), QColor(0, 0, 0, 50));
p.end();
l->setPixmap(QPixmap::fromImage(image));

Upvotes: 8

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