Saving already opened image ...

[Godlike]

To be more exact, done this:

void ImageViewer::save()
{
	QString s = QFileDialog::getSaveFileName(this,"Choose a filename to save under",QDir::currentPath(),"Images (*.png *.xpm *.jpg)");
	QImage image(s);
	QByteArray ba;
	QBuffer buffer(&ba);
	buffer.open(QIODevice::WriteOnly);
	image.save(&buffer, "JPG");
}

void ImageViewer::save()
{
	QString s = QFileDialog::getSaveFileName(this,"Choose a filename to save under",QDir::currentPath(),"Images (*.png *.xpm *.jpg)");
	QImage image(s);
	QByteArray ba;
	QBuffer buffer(&ba);
	buffer.open(QIODevice::WriteOnly);
	image.save(&buffer, "JPG");
}

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doesnt save nothing as i specify
What have i missunderstood ?