code: def upgrade_settings(
      self, setting_values, variable_revision_number, module_name
  ):
      if variable_revision_number == 1:
          #
          # Added rgb_or_channels at position # 2, added channel count
          # at end.
          #
          setting_values = (
              setting_values[:2]
              + [CH_RGB]
              + setting_values[2:]
              + ["1", "Red: 1", "1", "Channel1"]
          )
          variable_revision_number = 2
  
      if variable_revision_number == 2:
          #
          # Added HSV settings
          #
          setting_values = (
              setting_values[:13]
              + [
                  "Yes",
                  "OrigHue",
                  "Yes",
                  "OrigSaturation",
                  "Yes",
                  "OrigValue",
              ]
              + setting_values[13:]
          )
          variable_revision_number = 3
  
      if variable_revision_number < 4:
          #
          # Standardize the channel choices
          #
          setting_values = list(setting_values)
          nchannels = int(setting_values[SLOT_CHANNEL_COUNT])
          for i in range(nchannels):
              idx = (
                  SLOT_FIXED_COUNT
                  + SLOT_CHANNEL_CHOICE
                  + i * SLOTS_PER_CHANNEL
              )
              channel_idx = self.get_channel_idx_from_choice(
                  setting_values[idx]
              )
              setting_values[idx] = channel_idx + 1
          variable_revision_number = 4
  
      return setting_values, variable_revision_number
  
imports: import re
  import matplotlib.colors
  import numpy
  from cellprofiler_core.image import Image
  from cellprofiler_core.module import Module
  from cellprofiler_core.setting import Binary
  from cellprofiler_core.setting import HiddenCount
  from cellprofiler_core.setting import SettingsGroup
  from cellprofiler_core.setting import ValidationError
  from cellprofiler_core.setting.choice import Choice
  from cellprofiler_core.setting.do_something import DoSomething
  from cellprofiler_core.setting.do_something import RemoveSettingButton
  from cellprofiler_core.setting.subscriber import ImageSubscriber
  from cellprofiler_core.setting.text import Float
  from cellprofiler_core.setting.text import ImageName
  from cellprofiler_core.setting.text import Integer
label_desc: Use image node_id 18 for calling the ColorToGray obj's underlying member method code with example usage: obj.upgrade_settings(setting_values, variable_revision_number, module_name) and returns: setting_values,  variable_revision_number