title: How to draw a point in an image using given coordinate
body: <p>I loaded the image and tried to draw a red point in an image</p>
  
  <pre><code>img=mpimg.imread('./images/im00001.jpg')
  red = [0,0,255]
  # Change one pixel
  img[ 0.,-26.10911452,0. ]=red
  imgplot = plt.imshow(img)
  </code></pre>
  
  <p>but the following error occurred</p>
  
  <blockquote>
    <p>ValueError: assignment destination is read-only</p>
  </blockquote>