title: inline images have low quality
body: <p>I'm loading a TIF file with scikit-image and displaying it inline in an ipython notebook  (version 2.2.0). This works, however, the image is quite small when first displayed, and when I resize it using the draggable handle on the bottom right of the image, it just rescales the image while retaining the resolution of the original, so it's very blurry when enlarged. It's basically as if ipython is converting my image into a thumbnail on the fly.</p>
  
  <p>I've tried using matplotlib's <code>plt.imshow()</code> as well, which has the exact same result. I'm starting the notebook with <code>ipython notebook --pylab inline</code>.</p>
  
  <pre><code>from skimage import io
  import matplotlib.pyplot as plt
  image_stack = io.MultiImage("my_image.tif")
  image = image_stack[0]  # it's a multi-page TIF, this gets the first image in the stack
  
  io.imshow(image)  # or plt.imshow(image)
  io.show()  # or plt.show()
  </code></pre>