Please, show you code, how you work with QMovie, and I don’t understand you need “Alpha background” as in Title or “background for images with alpha channel” as in topic body? :)

On a side note, QMovie is perfectly paintable with QPainter (you obtain the current frame with currentImage() or currentPixmap()).

that’s the code.

how do you suggest i use QPainter?

imageLabel has type QLabel, right? QLabel is subclass of QWidget, QWidget is subclass of QPaintDevice.
Use QPainter for imageLabel

So, I think Vass meant to overwrite paintEvent [doc.qt.nokia.com] and do the painting by yourselve instead of let QImageLabel do the painting for you.

yes, it’s a QLabel Object. Ok, i understand what you say but don’t know how to use QPainter for imageLabel

If you do the painting on your own, you overwrite paint event like the following code:

Gerolf It seems to me what I with you said about different things. As I understand samkpo has movie with alpha channel, and He want set background under this movie. You said about animate background for something with use Qmovie.

yes, that’s what i want

what exactly?

Ok, sorry, then I misunderstood….

i have a movie with alpha channel and i want to set a background under this movie

This code makes the background red. It’s important to call setAutoFillBackground(true) on the label, otherwise the background will not be changed!

You need to subclass QLabel (or simply write a new widget from scratch) and in its paintEvent paint the background and then the current QMovie frame; or you can enable autoFillBackground and change the label’s background palette. :)

Vass wrote
Gerolf It seems to me what I with you said about different things. As I understand samkpo has movie with alpha channel, and He want set background under this movie. You said about animate background for something with use Qmovie.

But then you can just paint the background beffore drawing the move:

Or position a label or widget with the needed background exactly below the imageLabel. (so position one widget with setgeometry or make obne label a child of the other one). Or does QLabel not draw the movie with transparent background?