title: TypeError: 'Image' object is not subscriptable
body: <p>trying to create a height map, but keep getting an TypeError says Image object is not subscriptable.  No idea why.</p>
  <pre><code>pixels = Image.new('RGB', (1789, 1789), color = 'red')
      for i in range(pixels.size[0]): 
          for j in range(pixels.size[1]):
              if pixels[i,j] != (255, 0, 0):
                  pixels[i,j] = (0, 0 ,0)
  
  
  </code></pre>