How to 'save as' an edited image (png) using a file dialog in tkinter and Pil in Python

You should save the image through the save method that in Image object:

file = filedialog.asksaveasfile(mode='w', defaultextension=".png")if file:    im.save(file) # saves the image to the input file name. 

I finally figured it out. I ended up creating each component (the image and text) separately and then saving the final image as a composite.Here is the final code:

  def onOpen(self):        im = Image.open(askopenfilename())        caption = simpledialog.askstring("Label", "What would you like the label on your picture to say?")        fontsize = 30        if im.mode != "RGBA":            im = im.convert("RGBA")        txt = Image.new('RGBA', im.size, (255,255,255,0))        draw = ImageDraw.Draw(txt)        font = ImageFont.truetype("arial.ttf", fontsize)        draw.text((0, 0),caption,(255,0,0),font=font)        file = filedialog.asksaveasfile(mode='w', defaultextension=".png", filetypes=(("PNG file", "*.png"),("All Files", "*.*") ))        if file:            abs_path = os.path.abspath(file.name)            out = Image.alpha_composite(im, txt)            out.save(abs_path) # saves the image to the input file name.