title: Python convert True False matrix to image
body: <p>I have a matrix consisting of True and False values. I want to print this as an image where all the True values are white and the False values are black. The matrix is called indices. I have tried the following:</p>
  
  <pre><code>indices = indices.astype(int)  #To convert the true to 1 and false to 0
  indices*=255                   #To change all the 1's to 255
  cv2.imshow('Indices',indices)
  cv2.waitKey()
  </code></pre>
  
  <p>This is printing a fully black image. When I try, print <code>(indices==255).sum()</code>, it returns a values of 669 which means that there are 669 elements/pixels in the indices matrix which should be white. But I can only see a pure black image. How can I fix this?</p>