title: displaying image using a label
body: <p>I have converted a numpy array into a pixmap to display it on a label within my GUI. When I run the program, the GUI closes for some reason (no error messages).</p>
  
  <pre><code>height, width = input_image.shape
  bytesPerLine = 3 * width
  qImg = QtGui.QImage(input_image.data, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)
  pixmap01 = QtGui.QPixmap.fromImage(qImg)
  self.pixmap_image = QtGui.QPixmap(pixmap01)
  self.ui.label_imageDisplay.setPixmap(self.pixmap_image)
  self.ui.label_imageDisplay.setAlignment(QtCore.Qt.AlignCenter)
  self.ui.label_imageDisplay.setScaledContents(True)
  self.ui.label_imageDisplay.setMinimumSize(1,1)
  self.ui.label_imageDisplay.show()
  </code></pre>