title: Is it possible to overlay images in python so overlapping colors become darker?
body: <p>So I'm creating a program that takes 10*10 images, converts them to black and light grey, combine's them, and save them to a file, but I want the images, when combined, to have the light grey, when overlapping other grey(of any shade) to get darker(or closer to white, but still grey).
  I have made it so the images put in are transferred to black and light grey, but when I use my combining system(iv'e used paste and blend) it comes out as all black or all grey.</p>
  <p>How can I make it overlap?
  Thank You!</p>