title: How to use PIL to make all white pixels transparent?
body: <p>I'm trying to make all white pixels transparent using the Python Image Library.  (I'm a C hacker trying to learn python so be gentle)
  I've got the conversion working (at least the pixel values look correct) but I can't figure out how to convert the list into a buffer to re-create the image.  Here's the code</p>
  
  <pre><code>img = Image.open('img.png')
  imga = img.convert("RGBA")
  datas = imga.getdata()
  
  newData = list()
  for item in datas:
      if item[0] == 255 and item[1] == 255 and item[2] == 255:
          newData.append([255, 255, 255, 0])
      else:
          newData.append(item)
  
  imgb = Image.frombuffer("RGBA", imga.size, newData, "raw", "RGBA", 0, 1)
  imgb.save("img2.png", "PNG")
  </code></pre>