old_contents: # Print image to file
  import sys
  import cv2
  import numpy
  import matplotlib
  from plantcv.plantcv import params
  from plantcv.plantcv import fatal_error
  
  
  def print_image(img, filename):
      """Save image to file.
  
      Inputs:
      img      = image object
      filename = name of file to save image to
  
      :param img: numpy.ndarray
      :param filename: string
      :return:
      """
  
      # Print numpy array type images
      image_type = type(img)
      if image_type == numpy.ndarray:
          matplotlib.rcParams['figure.dpi'] = params.dpi
          cv2.imwrite(filename, img)
  
      # Print matplotlib type images
      elif image_type == matplotlib.figure.Figure:
          img.savefig(filename, dpi=params.dpi)
  
      # Print ggplot type images
      elif str(image_type) == "<class 'plotnine.ggplot.ggplot'>":
          img.save(filename)
  
      else:
          fatal_error("Error writing file " + filename + ": input img is " + str(type(img))+ ", not a numpy.ndarray, " +
                      "matplotlib.figure, or plotnine.ggplot and cannot get saved out with print_image.")
  
new_contents: # Print image to file
  import sys
  import cv2
  import numpy
  import matplotlib
  from plantcv.plantcv import params
  from plantcv.plantcv import fatal_error
  
  
  def print_image(img, filename):
      """Save image to file.
  
      Inputs:
      img      = image object
      filename = name of file to save image to
  
      :param img: numpy.ndarray
      :param filename: string
      :return:
      """
  
      # Print numpy array type images
      image_type = type(img)
      if image_type == numpy.ndarray:
          #matplotlib.rcParams['figure.dpi'] = params.dpi
          cv2.imwrite(filename, img)
  
      # Print matplotlib type images
      elif image_type == matplotlib.figure.Figure:
          img.savefig(filename, dpi=params.dpi)
  
      # Print ggplot type images
      elif str(image_type) == "<class 'plotnine.ggplot.ggplot'>":
          img.save(filename)
  
      else:
          fatal_error("Error writing file " + filename + ": input img is " + str(type(img))+ ", not a numpy.ndarray, " +
                      "matplotlib.figure, or plotnine.ggplot and cannot get saved out with print_image.")
  
subject: duplicate unit test failure in dominik's pr