Changed add_grayscale_image_to_plot test to use matplotlib's imread f…

…unction because scipy's imread is deprecated. Also eliminated the comment about matplotlib/matplotlib#4260 since it appears to be resolved.

tests/add_grayscale_image_to_plot/add_grayscale_image_to_plot.py

@@ -7,24 +7,20 @@
 
 import clearplot.figure as cpfig
 import clearplot as cp
-import os, scipy.misc
+import os
+import matplotlib.pyplot
 data_dir = os.path.join(os.path.dirname(os.path.dirname(cp.__file__)), \
     'doc', 'source', 'data')
 
 #Verification of adding an image and adding a color bar
 #Load image data
 path = os.path.join(data_dir, 'fiber_image.tiff')
-im = scipy.misc.imread(path)
+im = matplotlib.pyplot.imread(path)
 fig = cpfig.Figure()
 ax = fig.add_axes()
 ax.x_label = ['x', 'pix']
 ax.y_label = ['y', 'pix']
 im_obj = ax.add_image(im, im_interp = 'bilinear', c_map = cp.colors.c_maps['light_gray'])
 ax.x_tick = 50
 fig.add_color_bar(im_obj)
-fig.auto_adjust_layout()
-#As reported in issue #4260 on Github 
-#(https://github.com/matplotlib/matplotlib/issues/4260) matplotlib makes the
-#axes background black when saving pdfs, with 1 image, grayscale colormaps, and
-#transparent background.  So we avoid this by making the background opaque.
-fig.save('add_grayscale_image_to_plot', transparent = False)
+fig.auto_adjust_layout()