[Qt-interest] Background colour for qLabel QPixmap

[phil prentice]

HI
  I am doing the following:-

m_rangeLabel = new QLabel("");
QPixmap OffPixmap(":resources/images/darkGreen.png");
m_rangeLabel->setPixmap(OffPixmap);

It draws a green round dot as the label which is great.

However it leaves a white background around the (circle)dot which I would 
prefer to be the parent background colour; so all I see is the round dot and 
not a white square with a green dot inside.

How do I achieve this? 
Do I somehow use QPixmap::setMask() to do this or is there a better way?

Help appreciated

Phil