title: Images dimensions error in python
body: <p>Trying to match two images to find out the scores between them.But it shows some dimension error.Unable to fix the issue.My code is given below:</p>
  
  <pre><code>from skimage.measure import compare_ssim
  #import argparse
  #import imutils
  import cv2
  
  img1="1.png"
  img2="2.png"
  
  
  # load the two input images
  imageA = cv2.imread(img1)
  imageB = cv2.imread(img2)
  
  # convert the images to grayscale
  grayA = cv2.cvtColor(imageA, cv2.COLOR_BGR2GRAY)
  grayB = cv2.cvtColor(imageB, cv2.COLOR_BGR2GRAY)
  
  
  # compute the Structural Similarity Index (SSIM) between the two
  # images, ensuring that the difference image is returned
  (score, diff) = compare_ssim(grayA, grayB, full=True)
  diff = (diff * 255).astype("uint8")
  print("SSIM: {}".format(score))
  </code></pre>
  
  <p>This give n an error:</p>
  
  <pre><code>raise ValueError('Input images must have the same dimensions.')
  
  ValueError: Input images must have the same dimensions.
  </code></pre>
  
  <p>How to fix this issue?</p>