QGraphicsColorizeEffect doesn't work well with QWidget on MAC

The following code works on Linux/Windows but doesn't have any effect on Mac.
QGraphicsColorizeEffect *graphicsColor = new QGraphicsColorizeEffect;
graphicsColor ->setColor(Qt::red);
graphicsColor->setEnabled(true);
this->setGraphicsEffect(graphicsColor);

But the examples/effects/fademessage seems to work on Mac.