diff --git a/tests/python_tests/image_filters_test.py b/tests/python_tests/image_filters_test.py
index c122294c9..88277d1f2 100644
--- a/tests/python_tests/image_filters_test.py
+++ b/tests/python_tests/image_filters_test.py
@@ -50,7 +50,7 @@ if 'shape' in mapnik.DatasourceCache.plugin_names():
             actual = '/tmp/mapnik-style-image-filter-' + filename + '.png'
             expected = 'images/style-image-filter/' + filename + '.png'
             im.save(actual,"png32")
-            if not os.path.exists(expected):
+            if not os.path.exists(expected) or os.environ.get('UPDATE'):
                 print 'generating expected test image: %s' % expected
                 im.save(expected,'png32')
             expected_im = mapnik.Image.open(expected)
diff --git a/tests/python_tests/images/style-image-filter/agg-stack-blur22.png b/tests/python_tests/images/style-image-filter/agg-stack-blur22.png
index b6050539f..746c561cb 100644
Binary files a/tests/python_tests/images/style-image-filter/agg-stack-blur22.png and b/tests/python_tests/images/style-image-filter/agg-stack-blur22.png differ
diff --git a/tests/python_tests/images/style-image-filter/blur.png b/tests/python_tests/images/style-image-filter/blur.png
index 64e82968d..2d438c39d 100644
Binary files a/tests/python_tests/images/style-image-filter/blur.png and b/tests/python_tests/images/style-image-filter/blur.png differ
diff --git a/tests/python_tests/images/style-image-filter/edge-detect.png b/tests/python_tests/images/style-image-filter/edge-detect.png
index 89b06685f..58dec8a04 100644
Binary files a/tests/python_tests/images/style-image-filter/edge-detect.png and b/tests/python_tests/images/style-image-filter/edge-detect.png differ
diff --git a/tests/python_tests/images/style-image-filter/emboss.png b/tests/python_tests/images/style-image-filter/emboss.png
index f6344727f..5a23fd379 100644
Binary files a/tests/python_tests/images/style-image-filter/emboss.png and b/tests/python_tests/images/style-image-filter/emboss.png differ
diff --git a/tests/python_tests/images/style-image-filter/gray.png b/tests/python_tests/images/style-image-filter/gray.png
index 36e6df7f8..73a401533 100644
Binary files a/tests/python_tests/images/style-image-filter/gray.png and b/tests/python_tests/images/style-image-filter/gray.png differ
diff --git a/tests/python_tests/images/style-image-filter/invert.png b/tests/python_tests/images/style-image-filter/invert.png
index ffc1e03a3..b87a15bee 100644
Binary files a/tests/python_tests/images/style-image-filter/invert.png and b/tests/python_tests/images/style-image-filter/invert.png differ
diff --git a/tests/python_tests/images/style-image-filter/none.png b/tests/python_tests/images/style-image-filter/none.png
index b745b75d0..7546b09b5 100644
Binary files a/tests/python_tests/images/style-image-filter/none.png and b/tests/python_tests/images/style-image-filter/none.png differ
diff --git a/tests/python_tests/images/style-image-filter/sharpen.png b/tests/python_tests/images/style-image-filter/sharpen.png
index 3c1130634..5fff1d85f 100644
Binary files a/tests/python_tests/images/style-image-filter/sharpen.png and b/tests/python_tests/images/style-image-filter/sharpen.png differ
diff --git a/tests/python_tests/images/style-image-filter/sobel.png b/tests/python_tests/images/style-image-filter/sobel.png
index 281d99aa7..0f667c343 100644
Binary files a/tests/python_tests/images/style-image-filter/sobel.png and b/tests/python_tests/images/style-image-filter/sobel.png differ
diff --git a/tests/python_tests/images/style-image-filter/x-gradient.png b/tests/python_tests/images/style-image-filter/x-gradient.png
index fc19f8b1a..fb790ec07 100644
Binary files a/tests/python_tests/images/style-image-filter/x-gradient.png and b/tests/python_tests/images/style-image-filter/x-gradient.png differ
diff --git a/tests/python_tests/images/style-image-filter/y-gradient.png b/tests/python_tests/images/style-image-filter/y-gradient.png
index 1d0bbf20a..c6a38de00 100644
Binary files a/tests/python_tests/images/style-image-filter/y-gradient.png and b/tests/python_tests/images/style-image-filter/y-gradient.png differ
diff --git a/tests/python_tests/images/support/mapnik-marker-ellipse-render1.png b/tests/python_tests/images/support/mapnik-marker-ellipse-render1.png
index 254f81172..7854c5621 100644
Binary files a/tests/python_tests/images/support/mapnik-marker-ellipse-render1.png and b/tests/python_tests/images/support/mapnik-marker-ellipse-render1.png differ
diff --git a/tests/python_tests/images/support/mapnik-marker-ellipse-render2.png b/tests/python_tests/images/support/mapnik-marker-ellipse-render2.png
index c2cd87699..c2a4963c3 100644
Binary files a/tests/python_tests/images/support/mapnik-marker-ellipse-render2.png and b/tests/python_tests/images/support/mapnik-marker-ellipse-render2.png differ
diff --git a/tests/python_tests/markers_complex_rendering_test.py b/tests/python_tests/markers_complex_rendering_test.py
index f66277f70..41f0a0eff 100644
--- a/tests/python_tests/markers_complex_rendering_test.py
+++ b/tests/python_tests/markers_complex_rendering_test.py
@@ -19,11 +19,12 @@ if 'csv' in mapnik.DatasourceCache.plugin_names():
         actual = '/tmp/mapnik-marker-ellipse-render1.png'
         expected = 'images/support/mapnik-marker-ellipse-render1.png'
         im.save(actual,'png32')
+        if os.environ.get('UPDATE'):
+            im.save(expected,'png32')
         expected_im = mapnik.Image.open(expected)
         eq_(im.tostring('png32'),expected_im.tostring('png32'), 'failed comparing actual (%s) and expected (%s)' % (actual,'tests/python_tests/'+ expected))
 
     def test_marker_ellipse_render2():
-        # currently crashes https://github.com/mapnik/mapnik/issues/1365
         m = mapnik.Map(256,256)
         mapnik.load_map(m,'../data/good_maps/marker_ellipse_transform2.xml')
         m.zoom_all()
@@ -32,6 +33,8 @@ if 'csv' in mapnik.DatasourceCache.plugin_names():
         actual = '/tmp/mapnik-marker-ellipse-render2.png'
         expected = 'images/support/mapnik-marker-ellipse-render2.png'
         im.save(actual,'png32')
+        if os.environ.get('UPDATE'):
+            im.save(expected,'png32')
         expected_im = mapnik.Image.open(expected)
         eq_(im.tostring('png32'),expected_im.tostring('png32'), 'failed comparing actual (%s) and expected (%s)' % (actual,'tests/python_tests/'+ expected))