title: how do I see all the bands of an .hdr file generated by ENVI.
body: <p>I am trying to list all the bands present in my .hdr file. I have more then 100 bands and it's  a hyperspectral data.</p>
  
  <pre><code>img = envi.open('Dun_Hyperion_Atm_Corr.hdr','Dun_Hyperion_Atm_Corr')
  
  view = imshow(img,(29,19,9))
  </code></pre>
  
  <p>It open the image but I want to open the image after selecting one of the band present in my .hdr file.
  I am using spectral library for it.</p>