diff --git a/examples/VideoSpeedTest.py b/examples/VideoSpeedTest.py
index f123ccc3..7131f9d1 100644
--- a/examples/VideoSpeedTest.py
+++ b/examples/VideoSpeedTest.py
@@ -103,6 +103,7 @@ def mkData():
                 dt = np.float
                 loc = 1.0
                 scale = 0.1
+                mx = 1.0
             
             if ui.rgbCheck.isChecked():
                 data = np.random.normal(size=(frames,width,height,3), loc=loc, scale=scale)
diff --git a/pyqtgraph/exporters/ImageExporter.py b/pyqtgraph/exporters/ImageExporter.py
index 69c02508..e600afc9 100644
--- a/pyqtgraph/exporters/ImageExporter.py
+++ b/pyqtgraph/exporters/ImageExporter.py
@@ -58,17 +58,17 @@ class ImageExporter(Exporter):
                     filter.insert(0, p)
             self.fileSaveDialog(filter=filter)
             return
-            
-        targetRect = QtCore.QRect(0, 0, self.params['width'], self.params['height'])
-        sourceRect = self.getSourceRect()
-        
-        
-        #self.png = QtGui.QImage(targetRect.size(), QtGui.QImage.Format_ARGB32)
-        #self.png.fill(pyqtgraph.mkColor(self.params['background']))
-        w, h = self.params['width'], self.params['height']
+
+        w = int(self.params['width'])
+        h = int(self.params['height'])
         if w == 0 or h == 0:
-            raise Exception("Cannot export image with size=0 (requested export size is %dx%d)" % (w,h))
-        bg = np.empty((self.params['height'], self.params['width'], 4), dtype=np.ubyte)
+            raise Exception("Cannot export image with size=0 (requested "
+                            "export size is %dx%d)" % (w, h))
+
+        targetRect = QtCore.QRect(0, 0, w, h)
+        sourceRect = self.getSourceRect()
+
+        bg = np.empty((h, w, 4), dtype=np.ubyte)
         color = self.params['background']
         bg[:,:,0] = color.blue()
         bg[:,:,1] = color.green()
diff --git a/pyqtgraph/opengl/items/GLBarGraphItem.py b/pyqtgraph/opengl/items/GLBarGraphItem.py
index b3060dc9..42d05fb7 100644
--- a/pyqtgraph/opengl/items/GLBarGraphItem.py
+++ b/pyqtgraph/opengl/items/GLBarGraphItem.py
@@ -8,7 +8,7 @@ class GLBarGraphItem(GLMeshItem):
         pos is (...,3) array of the bar positions (the corner of each bar)
         size is (...,3) array of the sizes of each bar
         """
-        nCubes = reduce(lambda a,b: a*b, pos.shape[:-1])
+        nCubes = np.prod(pos.shape[:-1])
         cubeVerts = np.mgrid[0:2,0:2,0:2].reshape(3,8).transpose().reshape(1,8,3)
         cubeFaces = np.array([
             [0,1,2], [3,2,1],
@@ -22,8 +22,5 @@ class GLBarGraphItem(GLMeshItem):
         verts = cubeVerts * size + pos
         faces = cubeFaces + (np.arange(nCubes) * 8).reshape(nCubes,1,1)
         md = MeshData(verts.reshape(nCubes*8,3), faces.reshape(nCubes*12,3))
-        
-        GLMeshItem.__init__(self, meshdata=md, shader='shaded', smooth=False)
 
-        
-        
\ No newline at end of file
+        GLMeshItem.__init__(self, meshdata=md, shader='shaded', smooth=False)