code: def prepare_settings(self, setting_values):
      try:
          num_stack_images = int(
              setting_values[OFF_STACK_CHANNEL_COUNT]
          )
      except ValueError:
          num_stack_images = 1
      del self.stack_channels[num_stack_images:]
      while len(self.stack_channels) < num_stack_images:
          self.add_stack_channel_cb()
  
imports: import numpy
  from cellprofiler_core.image import Image
  from cellprofiler_core.module import Module
  from cellprofiler_core.setting import Color, 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, RemoveSettingButton
  from cellprofiler_core.setting.subscriber import ImageSubscriber
  from cellprofiler_core.setting.text import ImageName, Float
label_desc: Use image node_id 5 for calling the GrayToColor obj's underlying member method code with example usage: obj.prepare_settings(setting_values) without return types