title: How to convert a 1 channel image into a 3 channel with PIL?
body: <p>I have an image that has one channel. I would like duplicate this one channel such that I can get a new image that has the same channel, just duplicated three times. Basically, making a quasi RBG image.</p>
  
  <p>I see some info on how to do this with OpenCV, but not in PIL. It looks easy in Numpy, but again, PIL is different. I don't want to get into the habit of jumping from library to library all the time.</p>