docs: def _invert(color, **kwargs):
      """ Returns the inverse (negative) of a color.
          The red, green, and blue values are inverted, while the opacity is left alone.
      """
      col = ColorValue(color)
      args = [
          255.0 - col.value[0],
          255.0 - col.value[1],
          255.0 - col.value[2],
          col.value[3],
      ]
      inverted = ColorValue(args)
      return inverted