Add Pillow dependency via imageio, fix tests

.travis.yml

@@ -4,11 +4,11 @@ sudo: false
 matrix:
   include:
     - python: "2.7"
-      env: DEPS="numpy=1.8* slicerator tifffile" DEPSPIP="imageio" BUILD_DOCS=false
+      env: DEPS="numpy=1.8* slicerator pillow tifffile jinja2" DEPSPIP="imageio" BUILD_DOCS=false
     - python: "2.7"
       env: DEPS="numpy slicerator scipy pillow matplotlib scikit-image jinja2 av libtiff tifffile jpype1" DEPSPIP="moviepy imageio" BUILD_DOCS=false
     - python: "3.6"
-      env: DEPS="numpy slicerator tifffile" DEPSPIP="imageio" BUILD_DOCS=false
+      env: DEPS="numpy slicerator pillow tifffile jinja2" DEPSPIP="imageio" BUILD_DOCS=false
     - python: "3.6"
       env: DEPS="numpy slicerator scipy pillow matplotlib scikit-image jinja2 av tifffile libtiff jpype1 ipython sphinx sphinx_rtd_theme numpydoc" DEPSPIP="moviepy imageio" BUILD_DOCS=true
 

pims/tests/test_common.py

@@ -448,7 +448,11 @@ def setUp(self):
         self.frame1 = np.load(os.path.join(path, 'bulk-water_frame1.npy'))
         self.klass = pims.ImageIOReader
         self.kwargs = dict()
-        self.v = self.klass(self.filename, **self.kwargs)
+        try:
+            self.v = self.klass(self.filename, **self.kwargs)
+        except imageio.core.fetching.NeedDownloadError:
+            imageio.plugins.ffmpeg.download()
+            self.v = self.klass(self.filename, **self.kwargs)
         self.expected_shape = (424, 640, 3)
         self.expected_len = 480
 
@@ -566,13 +570,15 @@ def setUp(self):
         _skip_if_no_PIL()
 
     def test_open_png(self):
+        _skip_if_no_imread()
         self.filenames = ['dummy_png.png']
         shape = (10, 11)
         save_dummy_png(path, self.filenames, shape)
         pims.open(os.path.join(path, 'dummy_png.png'))
         clean_dummy_png(path, self.filenames)
 
     def test_open_pngs(self):
+        _skip_if_no_imread()
         self.filepath = os.path.join(path, 'image_sequence')
         self.filenames = ['T76S3F00001.png', 'T76S3F00002.png',
                           'T76S3F00003.png', 'T76S3F00004.png',

setup.py

@@ -23,7 +23,7 @@
     description="Python Image Sequence",
     author="PIMS Contributors",
     install_requires=['slicerator>=0.9.7', 'six>=1.8', 'numpy>=1.7',
-                      'imageio'],
+                      'pillow', 'imageio'],
     author_email="dallan@pha.jhu.edu",
     url="https://github.com/soft-matter/pims",
     packages=['pims',