code: def delta_e_cie1994(color1, color2, K_L=1, K_C=1, K_H=1, K_1=0.045, K_2=0.015):
      
      color1_vector = _get_lab_color1_vector(color1)
      color2_matrix = _get_lab_color2_matrix(color2)
      delta_e = color_diff_matrix.delta_e_cie1994(
          color1_vector, color2_matrix, K_L=K_L, K_C=K_C, K_H=K_H, K_1=K_1, K_2=K_2)[0]
      return numpy.asscalar(delta_e)
docs: Calculates the Delta E (CIE1994) of two colors.
  
      K_l:
        0.045 graphic arts
        0.048 textiles
      K_2:
        0.015 graphic arts
        0.014 textiles
      K_L:
        1 default
        2 textiles