code: def nonzero_hsv_data(self):
          
          hsv_data = cv2.cvtColor(self.data, cv2.COLOR_BGR2HSV)
          nonzero_px = self.nonzero_pixels()
          return hsv_data[nonzero_px[:, 0], nonzero_px[:, 1], ...]
docs: Computes non zero hsv values.
  
          Returns
          -------
          :obj:`numpy.ndarray`
              array of the hsv values for the image