diff --git a/pyqtgraph/graphicsItems/AxisItem.py b/pyqtgraph/graphicsItems/AxisItem.py
index da57403f..e97f66d3 100644
--- a/pyqtgraph/graphicsItems/AxisItem.py
+++ b/pyqtgraph/graphicsItems/AxisItem.py
@@ -921,7 +921,7 @@ class AxisItem(GraphicsWidget):
                     p2[axis] += tickLength*tickDir
                 tickPen = self.pen()
                 color = tickPen.color()
-                color.setAlpha(lineAlpha)
+                color.setAlpha(int(lineAlpha))
                 tickPen.setColor(color)
                 tickSpecs.append((tickPen, Point(p1), Point(p2)))
         profiler('compute ticks')
@@ -1078,7 +1078,7 @@ class AxisItem(GraphicsWidget):
             p.setFont(self.tickFont)
         p.setPen(self.textPen())
         for rect, flags, text in textSpecs:
-            p.drawText(rect, flags, text)
+            p.drawText(rect, flags.__int__(), text)
 
         profiler('draw text')
 
diff --git a/pyqtgraph/graphicsItems/GradientEditorItem.py b/pyqtgraph/graphicsItems/GradientEditorItem.py
index b360b2f7..1cb11d1c 100644
--- a/pyqtgraph/graphicsItems/GradientEditorItem.py
+++ b/pyqtgraph/graphicsItems/GradientEditorItem.py
@@ -654,7 +654,7 @@ class GradientEditorItem(TickSliderItem):
             s = s1 * (1.-f) + s2 * f
             v = v1 * (1.-f) + v2 * f
             c = QtGui.QColor()
-            c.setHsv(h,s,v)
+            c.setHsv(*map(int, [h,s,v]))
             if toQColor:
                 return c
             else:
diff --git a/pyqtgraph/graphicsItems/GridItem.py b/pyqtgraph/graphicsItems/GridItem.py
index 0b1eb525..db64cbbf 100644
--- a/pyqtgraph/graphicsItems/GridItem.py
+++ b/pyqtgraph/graphicsItems/GridItem.py
@@ -153,7 +153,7 @@ class GridItem(UIGraphicsItem):
                     continue
 
                 ppl = dim[ax] / nl[ax]
-                c = np.clip(5.*(ppl-3), 0., 50.)
+                c = np.clip(5 * (ppl-3), 0., 50.).astype(int)
 
                 linePen = self.opts['pen']
                 lineColor = self.opts['pen'].color()