def saveScreenshot(self):
    format = 'png'

    initialPath = QDir.currentPath() + "/untitled." + format        # 'C:/Users/mcold/Dropbox/Python projects/PyQt_examples/desktop/untitled.png'

    fileName, _ = QFileDialog.getSaveFileName(self, "Save As", initialPath,
            "%s Files (*.%s);;All Files (*)" % (format.upper(), format))
    if fileName:
        self.originalPixmap.save(fileName, format)