class_docstr: example application main window 
code: def export(self):
      print("exporting")
      exporter = exp.ImageExporter(self.scene())
      exporter.parameters()["width"] = 420
      exporter.export("example_false_color_image.png")
  
file_path: pyqtgraph/doc/source/images/gen_example_false_color_image.py
imports: import numpy
  import pyqtgraph
  import pyqtgraph.exporters
  from pyqtgraph.Qt import QtCore, QtGui, QtWidgets, mkQApp
label_desc: Use image node_id 2 for calling the MainWindow obj's underlying member method code with example usage: obj.export() without return types