title: the output of color.label2rgb in skimage
body: <p>In the <a href="https://scikit-image.org/docs/dev/auto_examples/segmentation/plot_ncut.html#sphx-glr-auto-examples-segmentation-plot-ncut-py" rel="nofollow noreferrer">normalized cut code segment</a>, I am not very clear about the output of <strong>color.label2rgb</strong>.</p>
  
  <pre><code>labels1 = segmentation.slic(img, compactness=30, n_segments=400)
  out1 = color.label2rgb(labels1, img, kind='avg')
  </code></pre>
  
  <p>when I output the result of <strong>labels1</strong> and the different dimensions of <strong>out1</strong>, looks like the result of <strong>out1</strong> does not match the entry values in <strong>labels1</strong>. What are the meanings of the entry values in <strong>out1</strong>. How do they relate to the label IDs in <strong>labels1</strong>?</p>
  
  <p><a href="https://i.stack.imgur.com/f0Dg2.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f0Dg2.jpg" alt="enter image description here"></a></p>