code: def img_6x6_lc():
      """
      Generates an RGB image 6x6. It is all 7x7, besides the edges (low contrast)
  
      Returns
      -------
      out : ndarray
          6x6 uint8 image
      """
      img = np.ones((6, 6, 1))
      img[:, 0] = 0
      img[:, -1] = 0
      img[0, :] = 0
      img[-1, :] = 0
      return np.dstack((img, img, img)).astype(np.uint8) * 127
  
file_path: solt/tests/fixtures.py
imports: import pytest
  import numpy
  from .utils import gen_gs_img_black_edge
label_desc: Use image node_id 15 for calling a global function with example usage: img_6x6_lc() and returns: unknown