title: transparent background in gif using Python Imageio
body: <p>Basically I am using following piece of code to make gif out of images, my images are <code>png</code> with transparent background but the gif is with black background. I dont know how to make the gif with transparent background. </p>
  
  <pre><code>#gif writer
  with io.get_writer('my.gif', mode='I', duration=0.1) as writer:
      for filename in file_names:
          image = io.imread(filename)
          writer.append_data(image)
  #writer.close()
  </code></pre>
  
  <p>where <code>filenames</code> is an array with all the names of file to be used. </p>