title: Measuring Average Brightness of a Black and White Image?
body: <p>I currently have a code for measuring the average brightness of an RGB image.
  When i run this with a black and white image, the RGB values are the same, e.g. 37, 37, 37
  I have no idea about colours etc but i dont think this is correct</p>
  
  <p>Here is my code at the moment:</p>
  
  <pre><code>from PIL import Image
  from math import sqrt
  
  imag = Image.open("../Images/pexels-photo-57905.jpeg")
  
  imag = imag.convert ('RGB')
  imag.show()
  
  X,Y = 0,0
  
  pixelRGB = imag.getpixel((X,Y))
  R,G,B = pixelRGB
  brightness = sum([R,G,B])/3 ##0 is dark (black) and 255 is bright (white)
  print(brightness)
  print(R,G,B)
  </code></pre>
  
  <p>In a nutshell, i must convert an RGB image into grayscale, which im using .convert('LA') for, i must THEN measure the brightness of the image by adding the black and white values then dividing them by 2</p>