text: #!/Users/admin/Desktop/Projects/EDU/the-ultimate-beginners-guide-to-django/sanzharsblog/venv/bin/python3.6
  #
  # The Python Imaging Library
  # $Id$
  #
  # this demo script creates four windows containing an image and a slider.
  # drag the slider to modify the image.
  #
  
  import sys
  
  if sys.version_info[0] > 2:
      import tkinter
  else:
      import Tkinter as tkinter
  
  from PIL import Image, ImageTk, ImageEnhance
  
  #
  # enhancer widget
  
  
  class Enhance(tkinter.Frame):
      def __init__(self, master, image, name, enhancer, lo, hi):
          tkinter.Frame.__init__(self, master)
  
          # set up the image
          self.tkim = ImageTk.PhotoImage(image.mode, image.size)
          self.enhancer = enhancer(image)
          self.update("1.0")  # normalize
  
          # image window
          tkinter.Label(self, image=self.tkim).pack()
  
          # scale
          s = tkinter.Scale(self, label=name, orient=tkinter.HORIZONTAL,
                    from_=lo, to=hi, resolution=0.01,
                    command=self.update)
          s.set(self.value)
          s.pack()
  
      def update(self, value):
          self.value = float(value)
          self.tkim.paste(self.enhancer.enhance(self.value))
  
  #
  # main
  
  if len(sys.argv) != 2:
      print("Usage: enhancer file")
      sys.exit(1)
  
  root = tkinter.Tk()
  
  im = Image.open(sys.argv[1])
  
  im.thumbnail((200, 200))
  
  Enhance(root, im, "Color", ImageEnhance.Color, 0.0, 4.0).pack()
  Enhance(tkinter.Toplevel(), im, "Sharpness", ImageEnhance.Sharpness, -2.0, 2.0).pack()
  Enhance(tkinter.Toplevel(), im, "Brightness", ImageEnhance.Brightness, -1.0, 3.0).pack()
  Enhance(tkinter.Toplevel(), im, "Contrast", ImageEnhance.Contrast, -1.0, 3.0).pack()
  
  root.mainloop()
  