Problem using QImages (failing to save)

Hello, I am trying to get the image of each shape in the layout for a specific layer. I could actually achieve that by using

lv.zoom_box(pya.DBox((l/dbu),(b/dbu), (r/dbu),(t/dbu)))  
image_path = os.path.join(image_location, file_name + ".png")
lv.save_image(image_path,image_width,image_height)

However, I guess, I need to use Qimage because later I want to add the center coordinates of each shape on the image as a text.
I try the following but it fails to successfully write the image

my_q_image=lv.get_image_with_options (640, 480,1,0,0, pya.DBox(l/dbu, b/dbu, r/dbu, t/dbu),1)
check=my_q_image.save(image_path,'0',-1) #returns false if fail to write the image
print(check) #it is false :(

Here is my full code. Thanks in advance! (Note: If you could also provide the code for writing text, I would really appreciate!)

    import pya
    import os
    mylayout = pya.Layout()


    path=r'C:\Users\ACER\Desktop\Images\Cell4.oas'
    image_location=r'C:\Users\ACER\Desktop\Images'
    image_width=480
    image_height=640

    dbu=1000

    lmap = mylayout.read(path)


    app = pya.Application.instance()
    mw = app.main_window()
    mw.load_layout(path,0)  #load the layout to the mainwindow so that you can see it
    lv = mw.current_view()


    mycell=mylayout.cell(0) # is a pointer to the 'cell' object  (You can also refer to cell object with its name like: a=mylayout.cell(‘TOP’)
    shapes = mycell.shapes(0)   #iterate through all shapes in a given layer for a given cell

    counter=0
    for i in shapes.each():
      #print(i.box_center)  #center coordinates of of each box shape
      #print(i.box) #bottom x , bottom y, upper x, upper y coordinates of the shape
      l=i.box.left
      b=i.box.bottom
      r=i.box.right
      t=i.box.top
      counter=counter+1
      file_name='shape'+str(counter)  #makes file name as shape1, shape2 ...
      image_path = os.path.join(image_location, file_name + ".png")

    #lv.zoom_box(pya.DBox((l/dbu),(b/dbu), (r/dbu),(t/dbu)))  #If you uncomment the following three lines it will work but then how to add a text?
    #image_path = os.path.join(image_location, file_name + ".png")
    #lv.save_image(image_path,image_width,image_height)

    my_q_image=lv.get_image_with_options (640, 480,1,0,0, pya.DBox(l/dbu, b/dbu, r/dbu, t/dbu),1)
    check=my_q_image.save(image_path,'0',-1) #returns false if fail to write the image
    print(check) #it is false :(