Cleanup following using Pillow as universal image reader

Author: timhoffm

INSTALL.rst

@@ -46,7 +46,7 @@ To run the test suite:
 * extract the :file:`lib/matplotlib/tests` or :file:`lib/mpl_toolkits/tests`
   directories from the source distribution;
 * install test dependencies: `pytest <https://pypi.org/project/pytest>`_,
-  Pillow, MiKTeX, GhostScript, ffmpeg, avconv, ImageMagick, and `Inkscape
+  MiKTeX, GhostScript, ffmpeg, avconv, ImageMagick, and `Inkscape
   <https://inkscape.org/>`_;
 * run ``python -mpytest``.
 
@@ -126,6 +126,7 @@ Matplotlib requires the following dependencies:
 * `cycler <http://matplotlib.org/cycler/>`_ (>= 0.10.0)
 * `dateutil <https://pypi.org/project/python-dateutil>`_ (>= 2.1)
 * `kiwisolver <https://github.com/nucleic/kiwi>`_ (>= 1.0.0)
+* `Pillow <https://pillow.readthedocs.io/en/latest/>`_ (>= 6.2)
 * `pyparsing <https://pyparsing.wikispaces.com/>`_
 
 Optionally, you can also install a number of packages to enable better user
@@ -160,8 +161,6 @@ etc., you can install the following:
   <https://libav.org/avconv.html>`_: for saving movies;
 * `ImageMagick <https://www.imagemagick.org/script/index.php>`_: for saving
   animated gifs;
-* `Pillow <https://pillow.readthedocs.io/en/latest/>`_ (>= 3.4): for a larger
-  selection of image file formats: JPEG, BMP, and TIFF image files;
 * `LaTeX <https://miktex.org/>`_ and `GhostScript (>=9.0)
   <https://ghostscript.com/download/>`_ : for rendering text with LaTeX.
 

lib/matplotlib/figure.py

@@ -2143,9 +2143,7 @@ def savefig(self, fname, *, transparent=None, **kwargs):
 
         pil_kwargs : dict, optional
             Additional keyword arguments that are passed to `PIL.Image.save`
-            when saving the figure.  Only applicable for formats that are saved
-            using Pillow, i.e. JPEG, TIFF, and (if the keyword is set to a
-            non-None value) PNG.
+            when saving the figure.
         """
 
         kwargs.setdefault('dpi', rcParams['savefig.dpi'])

lib/matplotlib/image.py

@@ -1629,8 +1629,9 @@ def thumbnail(infile, thumbfile, scale=0.1, interpolation='bilinear',
     Parameters
     ----------
     infile : str or file-like
-        The image file -- must be PNG, or Pillow-readable if you have Pillow_
-        installed.
+        The image file. Matplotlib relies on Pillow_ for image reading, and
+        thus supports a wide range of file formats, including PNG, JPG, TIFF
+        and others.
 
         .. _Pillow: http://python-pillow.org/
 

lib/matplotlib/tests/test_image.py

@@ -220,12 +220,8 @@ def test_imshow_zoom(fig_test, fig_ref):
 def test_imshow_pil(fig_test, fig_ref):
     style.use("default")
     PIL = pytest.importorskip("PIL")
-    # Pillow<=6.0 fails to open pathlib.Paths on Windows (pillow#3823), and
-    # Matplotlib's builtin png opener doesn't handle them either.
-    png_path = str(
-        Path(__file__).parent / "baseline_images/pngsuite/basn3p04.png")
-    tiff_path = str(
-        Path(__file__).parent / "baseline_images/test_image/uint16.tif")
+    png_path = Path(__file__).parent / "baseline_images/pngsuite/basn3p04.png"
+    tiff_path = Path(__file__).parent / "baseline_images/test_image/uint16.tif"
     axs = fig_test.subplots(2)
     axs[0].imshow(PIL.Image.open(png_path))
     axs[1].imshow(PIL.Image.open(tiff_path))