It would be very useful to have a dialog designed to save images, where one can choose size, (use actual size, specify desired size of choose a paper size), resolution, orientation, image format, maybe have a preview of the image one is saving, etc. etc..
It could maybe be made a static method as part of the QFileDialog class:
bool ok = QFileDialog::saveImage( const QPixmap &image, QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), const QString & filter = QString(), QString * selectedFilter = 0, Options options = 0 )