[PyQt] Set a SVG image as background and with transparency

David Boddie david at boddie.org.uk
Wed Aug 8 01:37:34 BST 2007

On Mon, 6 Aug 2007 11:17:18 -0300, Gustavo A. Díaz wrote:

> I tried to render a svg file and load as background, which i didn't
> succeed... i just threated it as a pixmaps to load it, but with that i cant
> set transparency ,if i am not wrong.

Pixmaps can have levels of transparency, too.

> For example, i have a label which is the same size of my application and is
> where i put the image as background having this result:
> http://opencoffee.lnxteam.org/downloads/pub/pics/OpenCoffee_Server.png (is
> the mainWidget background, the bluish one)

So, do you want just the blue areas to be partially transparent?

I'm not sure how to do that.

> Now, i want to know how to load that image but rendering as a SVG file
> should be threated in that background. What i temporary did is:
> self.mainWindowPixmap = QtGui.QPixmap (
> ":/Pixmaps/pixmaps/oc_mainWindowBg.svg")
> self.mainWindowBg.setPixmap(self.mainWindowPixmap)
> (mainWindowBg is the QLabel)
> Which i know is not the correct way to threat a SVG image.

OK, but it's still worth testing with a pixmap - as you have done.

> I have two doubts here, one is i want to set transparency a SVG image,
> render and set it in that QLabel
> The other, is how do i set transparency for the window of that app using
> that SVG image? (which should have transparency if i am not wrong)

The transparency set using QWidget.setWindowOpacity() is for everything in
the window, which isn't what you want. It might be worth checking that this
works, anyway, because what you want to do will depend on system features
that this also needs.

> PS: i know David, i read those links about transparency... but i have those
> doubts and i have no clear how to render a svg file and load/set inside a
> QLabel

I would suggest using a QSvgWidget instead of a QLabel for displaying
SVG drawings that you want to be scalable.


More information about the PyQt mailing list