tableView for files: give one type a different colour: why doesn't this work?

[qt_gotcha]

using the stardelegate example I made a simple paint function to make a file with extension "001" blue:

void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                         const QModelIndex &index) const
{
	QStyleOptionViewItem opt = option;
	if (index.column() == 0)
	{
		QString name = index.model()->data(index, Qt::DisplayRole).toString();
		if (QFileInfo(name).suffix() == "001")
		{
			painter->setPen(QColor(0, 0, 255, 255));
			QFont f = painter->font();
			painter->setFont(f);
			opt.font.setItalic(true);
		}
	}
	QStyledItemDelegate::paint(painter, opt, index);
}

void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                         const QModelIndex &index) const
{
	QStyleOptionViewItem opt = option;
	if (index.column() == 0)
	{
		QString name = index.model()->data(index, Qt::DisplayRole).toString();
		if (QFileInfo(name).suffix() == "001")
		{
			painter->setPen(QColor(0, 0, 255, 255));
			QFont f = painter->font();
			painter->setFont(f);
			opt.font.setItalic(true);
		}
	}
	QStyledItemDelegate::paint(painter, opt, index);
}

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The files with 001 are displayed in italics but not in blue. So the selection and adapting opt works, but setPen doesn't. Why not? thanks.