code: def auto_density(color):
      
      blue_density = ansi_density(color, ANSI_STATUS_T_BLUE)
      green_density = ansi_density(color, ANSI_STATUS_T_GREEN)
      red_density = ansi_density(color, ANSI_STATUS_T_RED)
  
      densities = [blue_density, green_density, red_density]
      min_density = min(densities)
      max_density = max(densities)
      density_range = max_density - min_density
  
      # See comments in density_standards.py for VISUAL_DENSITY_THRESH to
      # understand what this is doing.
      if density_range <= VISUAL_DENSITY_THRESH:
          return ansi_density(color, ISO_VISUAL)
      elif blue_density > green_density and blue_density > red_density:
          return blue_density
      elif green_density > blue_density and green_density > red_density:
          return green_density
      else:
          return red_density
docs: Given a SpectralColor, automatically choose the correct ANSI T filter.
      Returns a tuple with a string representation of the filter the
      calculated density.
  
      :param SpectralColor color: The SpectralColor object to calculate
          density for.
      :rtype: float
      :returns: The density value, with the filter selected automatically.