title: How can i update image with tkinter slider (scale) value in python?
body: <p>I'm a beginner in python. All i want to do is create a simple GUI that implements basic Digital Image processing Algorithms. 
  I want to adjust brightness of an image with tkinter slider. but this is not working and i am clueless as i'm just beginner. I am expecting the scale widget callback to do some brightness adjustment work but due too some reason the call back is not being invoked.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>import Tkinter as tk
  import Image
  import ImageTk
  import numpy as np
  import tkFileDialog
  
  class DIP(tk.Frame):
      def __init__(self, parent):
          tk.Frame.__init__(self, parent) 
          self.parent = parent        
          self.initUI()
  
      def initUI(self):
          self.parent.title("DIP Algorithms- Simple Photo Editor")
          self.pack(fill = tk.BOTH, expand = 1)
  
          menubar = tk.Menu(self.parent)
          self.parent.config(menu = menubar)
  
          self.label1 = tk.Label(self, border = 25)
          self.label2 = tk.Label(self, border = 25)
          self.label1.grid(row = 1, column = 1)
          self.label2.grid(row = 1, column = 2)
  
          # File Menu
          fileMenu = tk.Menu(menubar)
          menubar.add_cascade(label = "File", menu = fileMenu)
  
          # Menu Item for Open Image
          fileMenu.add_command(label = "Open", command = self.onOpen)        
  
          # Basic menu
          basicMenu = tk.Menu(menubar)        
          menubar.add_cascade(label = "Basic", menu = basicMenu)
  
          # Menu Item for image negative
          basicMenu.add_command(label = "Negative", command = self.onNeg)
  
          #menu for brightness
          basicMenu.add_command(label = "Brightness", command = self.onBrghtness)
  
      def onBrghtness(self):
          #Image Brightness Adjustment Menu callback
          brgTk=tk.Tk()
          self.brgSc = tk.Scale( brgTk, from_=-50, to=50, orient=tk.HORIZONTAL, command=self.adjBright, length=200 ,width=10, sliderlength=15)
          self.brgSc.pack(anchor=tk.CENTER)
  
      def adjBright(self):
          print self.brgSc #***here how can i get slider value, this callback is not being invoked***???
  
      def onNeg(self):
          #Image Negative Menu callback
          self.I2 = 255-self.I;
          self.im = Image.fromarray(np.uint8(self.I2))
          photo2 = ImageTk.PhotoImage(self.im)
          self.label2.configure(image=photo2)
          self.label2.image = photo2 # keep a reference!
  
      def setImage(self):
          self.img = Image.open(self.fn)
          self.I = np.asarray(self.img)
          l, h = self.img.size
          text = str(2*l+100)+"x"+str(h+50)+"+0+0"
          self.parent.geometry(text)
          photo = ImageTk.PhotoImage(self.img)
          self.label1.configure(image = photo)
          self.label1.image = photo # keep a reference!
  
      def onOpen(self):
          #Open Callback
          ftypes = [('Image Files', '*.tif *.jpg *.png')]
          dlg = tkFileDialog.Open(self, filetypes = ftypes)
          filename = dlg.show()
          self.fn = filename
          #print self.fn #prints filename with path here
          self.setImage()
  
      #def onError(self):
          #box.showerror("Error", "Could not open file")    
  
  
  def main():
      root = tk.Tk()
      DIP(root)
      root.geometry("320x240")
      root.mainloop()  
  
  if __name__ == '__main__':
      main()
  </code></pre>
  
  <p>At the code where i mentioned the problem, the callback is failed because it says something like:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Python27\lib\lib-tk\Tkinter.py", line 1410, in __call__
      return self.func(*args) 
  TypeError: adjBright() takes exactly 1 argument (2 given)
  </code></pre>
  
  <p>Please do help, i know it may be stupid type of question to ask, but i'm just beginner and i hope i'll have deep understanding of PYTHON with time...</p>