[Interest] how to replace QImage::setAlphaChannel with composition modes?

[frares at gmail.com]

Hi,

The docs say that setAlphaChannel is obsolete, and also "Use one of the  
composition modes in QPainter::CompositionMode instead."

I have tried several ways, but did not succeed. Maybe I didn't understood  
quite well those composition modes, after all.

Any hints?

Thanks
Francisco
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