class_docstr: tests for arg.convert_image_color
code: def test_convert_color(self):
      img = np.random.randint(0, 255, (400, 300, 3), dtype=np.uint8)
      rgb = Image(img, "RGB")
      bgr = any2bgr(rgb)
      rgb2 = any2rgb(bgr)
      self.assertEqual(rgb.mode, "RGB")
      self.assertEqual(bgr.mode, "BGR")
      self.assertEqual(rgb2.mode, "RGB")
      self.assertTrue(np.array_equal(rgb, rgb2))
  
file_path: towhee/tests/unittests/types/test_arg.py
imports: import unittest
  import numpy
  from towhee.types import arg, to_image_color, Image
label_desc: Use image node_id 1 for calling the TestConvertImageColor obj's underlying member method code with example usage: obj.test_convert_color() without return types