QWidget transparency rendering

[Ntis]

Hello All,

I'm facing a weird probem. I have a form with some widget (QLabel) and trying to render them into a QImage with their background transparent.

I got the transparent background but the antialiased text is computed with the alias alpha, giving some junk on the edge : Tje text is written in white and the edge let appear some gray to black antialias ...
I tryed with a QPainter with CompositionMode_Source, With WA_transluscent an other optons I can't get a working sample with antialias computed in alpha channel only

Any help ?

Regards