Screenshot only for the rect of certain items on the scene

[afail]

Hi,

I am trying to make a screenshot/Pixmap out of certain graphicItems on a QGraphicsScene object like this:

QGraphicsItemGroup* itemGroup = new QGraphicsItemGroup(0);
 
foreach(QPointer<ListOfItems> item, itemsToPrint.list())
	{
		itemGroup->addToGroup(item);
	}
 
QRectF selectionRect = itemGroup->boundingRect();
QPixmap image(selectionRect.width(), selectionRect.height());

QGraphicsItemGroup* itemGroup = new QGraphicsItemGroup(0);

foreach(QPointer<ListOfItems> item, itemsToPrint.list())
	{
		itemGroup->addToGroup(item);
	}

QRectF selectionRect = itemGroup->boundingRect();
QPixmap image(selectionRect.width(), selectionRect.height());

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Then render the image and I hoped that it will render/print in the screenshot only the items I need to. But instead of that, the screnshot that is created is fuzzy (nothing visible is shown properly), and the items from the main scene disappear

How can I make screenshot of part of the scene over the boundingRect of items that match some criteria? any example on this?

thanks