DOC: update static image for interpolation_none_vs_nearest.py example

[efiring]

Gallery output from interpolation_none_vs_nearest.py:

[efiring]

Related: #6588 and #6590.

[jkseppan]

How exactly did you produce these images? Note that the example code does not actually create a pdf file, it uses the static file lib/matplotlib/mpl-data/sample_data/None_vs_nearest-pdf.png. When I change the example to really produce both images, on a recent master (6b1adfd) I get similar results on both backends. I converted the pdf file to png with

gs -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -sDEVICE=pngalpha -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r100 -sOutputFile=None_vs_nearest-pdf.png None_vs_nearest-pdf.pdf

diff --git a/examples/images_contours_and_fields/interpolation_none_vs_nearest.py b/examples/images_contours_and_fields/interpolation_none_vs_nearest.py
index 802c2d1..ab6dbe5 100644
--- a/examples/images_contours_and_fields/interpolation_none_vs_nearest.py
+++ b/examples/images_contours_and_fields/interpolation_none_vs_nearest.py
@@ -45,18 +45,19 @@ fig.text(0.75, 0.90, "Interpolation = 'nearest'", ha='center')
 # would save the figure as a PNG, save the same figure as a PDF, and
 # then compare them.  The following code would suffice.
 txt = fig.text(0.452, 0.95, 'Saved as a PNG', fontsize=18)
-# plt.savefig('None_vs_nearest-png.png')
-# txt.set_text('Saved as a PDF')
-# plt.savefig('None_vs_nearest-pdf.pdf')
+plt.savefig('None_vs_nearest-png.png')
+txt.set_text('Saved as a PDF')
+plt.savefig('None_vs_nearest-pdf.pdf')

 # Here, however, we need to display the PDF on a webpage, which means
 # the PDF must be converted into an image.  For the purposes of this
 # example, the 'Nearest_vs_none-pdf.pdf' has been pre-converted into
 #'Nearest_vs_none-pdf.png' at 80 dpi.  We simply need to load and
 # display it.
-pdf_im_path = cbook.get_sample_data('None_vs_nearest-pdf.png')
-pdf_im = plt.imread(pdf_im_path)
-fig2 = plt.figure(figsize=[8.0, 7.5])
-plt.figimage(pdf_im)
+#pdf_im_path = cbook.get_sample_data('None_vs_nearest-pdf.png')
+#pdf_im = plt.imread(pdf_im_path)
+#fig2 = plt.figure(figsize=[8.0, 7.5])
+#plt.figimage(pdf_im)
+
+#plt.show()

-plt.show()

[efiring]

Aha! I pulled the files straight from the gallery output, I believe, without looking to see what was going on. I was on the lookout for problems with the tick number selection.
When I generate the figures with v2.x, everything is as expected. (I don't think you are running with the version you think you are, though--the small image colormap should be viridis, and there should be fewer ticks.) The real bug is that the saved static image needs to be updated. I will edit the title of this issue accordingly.

[jkseppan]

You're right, I was invoking python from a different virtualenv. In any case, even with the correct python the results look similar across the two backends.

[efiring]

Closed by #6608