diff --git a/dither_pattern.py b/dither_pattern.py
index d69095b..8cb8e84 100644
--- a/dither_pattern.py
+++ b/dither_pattern.py
@@ -11,7 +11,7 @@ class DitherPattern:
 class NoDither(DitherPattern):
     """No dithering."""
     PATTERN = np.array(((0, 0), (0, 0)),
-                       dtype=np.float32).reshape(2, 2) / np.float(16)
+                       dtype=np.float32).reshape(2, 2) / np.float32(16)
     ORIGIN = (0, 1)
 
 
@@ -20,7 +20,7 @@ class FloydSteinbergDither(DitherPattern):
     # 0 * 7
     # 3 5 1
     PATTERN = np.array(((0, 0, 7), (3, 5, 1)),
-                       dtype=np.float32).reshape(2, 3) / np.float(16)
+                       dtype=np.float32).reshape(2, 3) / np.float32(16)
     ORIGIN = (0, 1)
 
 
@@ -31,7 +31,7 @@ class FloydSteinbergDither2(DitherPattern):
     PATTERN = np.array(
         ((0, 0, 0, 0, 0, 7),
          (3, 5, 1, 0, 0, 0)),
-        dtype=np.float32).reshape(2, 6) / np.float(16)
+        dtype=np.float32).reshape(2, 6) / np.float32(16)
     ORIGIN = (0, 2)
 
 
diff --git a/dither_shr.pyx b/dither_shr.pyx
index aff880d..dc8b61e 100644
--- a/dither_shr.pyx
+++ b/dither_shr.pyx
@@ -315,13 +315,15 @@ cdef (unsigned char)[:, ::1] _convert_cam16ucs_to_rgb12_iigs(float[:, ::1] point
         rgb = colour.convert(point_cam, "CAM16UCS", "RGB").astype(np.float32)
 
     # TODO: precompute this conversion matrix since it's static.  This accounts for about 10% of the CPU time here.
-    rgb12_iigs = np.clip(
-        # Convert to Rec.601 R'G'B'
-        colour.YCbCr_to_RGB(
-            # Gamma correct and convert Rec.709 R'G'B' to YCbCr
-            colour.RGB_to_YCbCr(
-                linear_to_srgb_array(rgb), K=colour.WEIGHTS_YCBCR['ITU-R BT.709']),
-            K=colour.WEIGHTS_YCBCR['ITU-R BT.601']), 0, 1).astype(np.float32) * 15
+    rgb12_iigs = np.ascontiguousarray(
+        np.clip(
+            # Convert to Rec.601 R'G'B'
+            colour.YCbCr_to_RGB(
+                # Gamma correct and convert Rec.709 R'G'B' to YCbCr
+                colour.RGB_to_YCbCr(
+                    linear_to_srgb_array(rgb), K=colour.WEIGHTS_YCBCR['ITU-R BT.709']),
+                K=colour.WEIGHTS_YCBCR['ITU-R BT.601']), 0, 1)
+        ).astype(np.float32) * 15
     return np.round(rgb12_iigs).astype(np.uint8)
 
 # Wrapper around _convert_cam16ucs_to_rgb12_iigs to allow calling from python while retaining fast path for cython
diff --git a/precompute_conversion.py b/precompute_conversion.py
index 857c715..abb3b9e 100644
--- a/precompute_conversion.py
+++ b/precompute_conversion.py
@@ -30,7 +30,8 @@ def main():
         rgb24_to_cam16ucs = colour.convert(all_rgb24, "RGB", "CAM16UCS").astype(
             np.float32)
     del all_rgb24
-    np.save("data/rgb24_to_cam16ucs.npy", rgb24_to_cam16ucs)
+    np.save("data/rgb24_to_cam16ucs.npy", np.ascontiguousarray(
+        rgb24_to_cam16ucs))
     del rgb24_to_cam16ucs
 
     print("Precomputing conversion matrix from 12-bit //gs RGB to CAM16UCS "
@@ -60,7 +61,8 @@ def main():
         rgb12_iigs_to_cam16ucs = colour.convert(
             rgb12_iigs, "RGB", "CAM16UCS").astype(np.float32)
     del rgb12_iigs
-    np.save("data/rgb12_iigs_to_cam16ucs.npy", rgb12_iigs_to_cam16ucs)
+    np.save("data/rgb12_iigs_to_cam16ucs.npy", np.ascontiguousarray(
+        rgb12_iigs_to_cam16ucs))
     del rgb12_iigs_to_cam16ucs
 
 
diff --git a/screen.py b/screen.py
index 8a51d45..7c69142 100644
--- a/screen.py
+++ b/screen.py
@@ -161,7 +161,8 @@ class DHGRScreen:
 
         # Apply effect of saturation
         yuv_to_rgb = np.array(
-            ((1, 0, 0), (0, saturation, 0), (0, 0, saturation)), dtype=np.float)
+            ((1, 0, 0), (0, saturation, 0), (0, 0, saturation)),
+            dtype=np.float32)
         # Apply hue phase rotation
         yuv_to_rgb = np.matmul(np.array(
             ((1, 0, 0), (0, np.cos(hue), np.sin(hue)), (0, -np.sin(hue),