title: Imagemagick convert low quality gif after chop
body: <p>I'm trying to chop the following gif as to remove four of the inner videos:
  <a href="https://i.stack.imgur.com/I9dWF.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/I9dWF.gif" alt="enter image description here"></a>
  I use this command:
  <code>convert  bair_action_free_00232.gif -gravity NorthWest -chop 256x0+65+0 vid_pred.gif</code></p>
  
  <p>The result looks really bad; the black frame flickers and the text looks awful.</p>
  
  <p><a href="https://i.stack.imgur.com/K99Rc.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K99Rc.gif" alt="enter image description here"></a></p>
  
  <p>Adding <code>-quality 99</code> doesn't help. Any tips?</p>
  
  <p>Gif Reference: <a href="https://alexlee-gk.github.io/video_prediction/" rel="nofollow noreferrer">https://alexlee-gk.github.io/video_prediction/</a></p>