Opacity QPainter in thread Qt4.7

[cupersuper]

Hi,

Qt 4.7. Outside the thread of code works fine:

QImage IMG;
QPainter PAINTER;
QPen PEN;
 
IMG.load("img.jpg");
PAINTER.begin(&IMG);
 
PEN.setColor("#ff0000");
PAINTER.setOpacity(0.30);
PAINTER.setPen(PEN);
PAINTER.drawText( 20, 20, "Test");

QImage IMG;
QPainter PAINTER;
QPen PEN;

IMG.load("img.jpg");
PAINTER.begin(&IMG);

PEN.setColor("#ff0000");
PAINTER.setOpacity(0.30);
PAINTER.setPen(PEN);
PAINTER.drawText( 20, 20, "Test");

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But when put into the thread drawText crash:

QObject::killTimers: timers cannot be stopped from another thread

QObject::killTimers: timers cannot be stopped from another thread

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If remove the method:

PAINTER.setOpacity(0.30);

PAINTER.setOpacity(0.30);

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or send it to 0 or 1 , starts to work fine.

Tried to change it to:

QColor clr = QColor("#ff0000");
PEN.setColor( QColor( clr.red(), clr.green(), clr.blue(), 254 ) );

QColor clr = QColor("#ff0000");
PEN.setColor( QColor( clr.red(), clr.green(), clr.blue(), 254 ) );

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but not help

Any ideas?
Thanks in advance)