docs: def pdftojpg(filehandle, meta):
      """Converts a PDF to a JPG and places it back onto the FileStorage instance
      passed to it as a BytesIO object.
  
      Optional meta arguments are:
          * resolution: int or (int, int) used for wand to determine resolution,
          defaults to 300.
          * width: new width of the image for resizing, defaults to 1080
          * bgcolor: new background color, defaults to 'white'
      """
      resolution = meta.get('resolution', 300)
      width = meta.get('width', 1080)
      bgcolor = Color(meta.get('bgcolor', 'white'))
      stream = BytesIO()
  
      with Image(blob=filehandle.stream, resolution=resolution) as img:
          img.background_color = bgcolor
          img.alpha_channel = False
          img.format = 'jpeg'
          ratio = width / img.width
          img.resize(width, int(ratio * img.height))
          img.compression_quality = 90
          img.save(file=stream)
  
      stream.seek(0)
      filehandle.stream = stream
      return filehandle