Saving already opened image ...

[Godlike]

I made a simple image viewer, now how do i save that image with save and also save as ? Can you paste me some code example how to do that.

I have read the image with:

QString fileName = QFileDialog::getOpenFileName(this,tr("Open File"), QDir::currentPath());
	if (!fileName.isEmpty()) 
	{
		QImage image(fileName);
		if (image.isNull())
		{
			QMessageBox::information(this, tr("ImageViewer"), tr("Cannot load %1.").arg(fileName));
                return;
		}
	imageLabel->setPixmap(QPixmap::fromImage(image));

QString fileName = QFileDialog::getOpenFileName(this,tr("Open File"), QDir::currentPath());
	if (!fileName.isEmpty()) 
	{
		QImage image(fileName);
		if (image.isNull())
		{
			QMessageBox::information(this, tr("ImageViewer"), tr("Cannot load %1.").arg(fileName));
                return;
		}
	imageLabel->setPixmap(QPixmap::fromImage(image));

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thx.