diff --git a/.circleci/config.yml b/.circleci/config.yml
index a2ade65ad..e9d3844bf 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -28,9 +28,7 @@ _save_cache: &save_cache
     - ~/.cache/coursier
     - ~/.ivy2/cache
     - ~/.sbt
-
-before_script:
-  - ulimit -c unlimited -S
+    - ~/.local
 
 jobs:
   test:
@@ -68,6 +66,7 @@ jobs:
           <<: *restore_cache
 
       - run: ulimit -c unlimited -S
+      - run: pip3 install --quiet --user -r pyrasterframes/src/main/python/requirements.txt
       - run:
           command: cat /dev/null | sbt makeSite
           no_output_timeout: 30m
diff --git a/.travis.yml b/.travis.yml
index 4ab034f02..12cad75b7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ cache:
     - $HOME/.ivy2/cache
     - $HOME/.sbt/boot
     - $HOME/.rf_cache
+    - $HOME/.cache/coursier
 
 scala:
   - 2.11.11
diff --git a/pyrasterframes/src/main/python/pyrasterframes/rf_ipython.py b/pyrasterframes/src/main/python/pyrasterframes/rf_ipython.py
index d13eb0e4f..c1fe857d4 100644
--- a/pyrasterframes/src/main/python/pyrasterframes/rf_ipython.py
+++ b/pyrasterframes/src/main/python/pyrasterframes/rf_ipython.py
@@ -29,8 +29,6 @@ def tile_to_png(tile, fig_size=None):
     import io
     from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
     from matplotlib.figure import Figure
-    import matplotlib.colors as colors
-    from matplotlib import cm
 
     # Set up matplotlib objects
     nominal_size = 2  # approx full size for a 256x256 tile
@@ -42,9 +40,8 @@ def tile_to_png(tile, fig_size=None):
     axis = fig.add_subplot(1, 1, 1)
 
     data = tile.cells
-    norm = colors.LogNorm(data.min(), data.max())
 
-    axis.imshow(data, norm=norm, cmap=cm.get_cmap("RdBu"))
+    axis.imshow(data)
     axis.set_aspect('equal')
     axis.xaxis.set_ticks([])
     axis.yaxis.set_ticks([])