code: def check_images(img_spec1, img_spec2, bkground_thresh=0.05):
      
  
      img1 = read_image(img_spec1, bkground_thresh)
      img2 = read_image(img_spec2, bkground_thresh)
  
      if img1.shape != img2.shape:
          raise ValueError('size mismatch! First image: {} Second image: {}\n'
                           'Two images to be compared must be of the same size in all dimensions.'.format(
              img1.shape,
              img2.shape))
  
      return img1, img2
docs: Reads the two images and assers identical shape.