code: def img_as_int(image, force_copy=False):
      """Convert an image to 16-bit signed integer format.
  
      Parameters
      ----------
      image : ndarray
          Input image.
      force_copy : bool, optional
          Force a copy of the data, irrespective of its current dtype.
  
      Returns
      -------
      out : ndarray of int16
          Output image.
  
      Notes
      -----
      The values are scaled between -32768 and 32767.
      If the input data-type is positive-only (e.g., uint8), then
      the output image will still only have positive values.
  
      """
      return _convert(image, np.int16, force_copy)
  
file_path: scikit-image/skimage/util/dtype.py
imports: import warnings
  from warnings import warn
  import numpy
label_desc: Use image node_id 11 for calling a global function with example usage: img_as_int(image, force_copy) and returns: _convert