code: def draft(self, mode, size):
      if len(self.tile) != 1:
          return
  
      # Protect from second call
      if self.decoderconfig:
          return
  
      d, e, o, a = self.tile[0]
      scale = 1
      original_size = self.size
  
      if a[0] == "RGB" and mode in ["L", "YCbCr"]:
          self._mode = mode
          a = mode, ""
  
      if size:
          scale = min(self.size[0] // size[0], self.size[1] // size[1])
          for s in [8, 4, 2, 1]:
              if scale >= s:
                  break
          e = (
              e[0],
              e[1],
              (e[2] - e[0] + s - 1) // s + e[0],
              (e[3] - e[1] + s - 1) // s + e[1],
          )
          self._size = (
              (self.size[0] + s - 1) // s,
              (self.size[1] + s - 1) // s,
          )
          scale = s
  
      self.tile = [(d, e, o, a)]
      self.decoderconfig = (scale, 0)
  
      box = (0, 0, original_size[0] / scale, original_size[1] / scale)
      return self.mode, box
  
imports: import array
  import io
  import math
  import os
  import struct
  import subprocess
  import sys
  import tempfile
  import warnings
  from .None import Image, ImageFile
  from ._binary import i16be
  from ._binary import i32be
  from ._binary import o8
  from ._binary import o16be
  from .JpegPresets import presets
label_desc: Use image node_id 3 for calling the JpegImageFile obj's underlying member method code with example usage: obj.draft(mode, size) and returns: self,  box