add bandand() bandor() bandeor() to py

convenience funcs

ChangeLog

@@ -4,6 +4,7 @@
 - vipsthumbnail uses vips_resize() rather than its own code
 - vipsthumbnail uses vips_premultiply() for better alpha quality
 - vips_copy() can turn 1xN or Nx1 M-band images into MxN one-band images
+- added bandand() bandor() bandeor() convenience funcs to Python
 
 7/5/15 started 8.0.3
 - dzsave and tif pyr write could fail for some image dimensions, thanks Jonas

python/Vips.py

@@ -840,6 +840,18 @@ class Image(Vips.Image):
         """Return the nearest integral value."""
         return self.round(Vips.OperationRound.RINT)
 
+    def bandand(self):
+        """AND image bands together."""
+        return self.bandbool(Vips.OperationBoolean.AND)
+
+    def bandor(self):
+        """OR image bands together."""
+        return self.bandbool(Vips.OperationBoolean.OR)
+
+    def bandeor(self):
+        """EOR image bands together."""
+        return self.bandbool(Vips.OperationBoolean.EOR)
+
     def bandsplit(self):
         """Split an n-band image into n separate images."""
         return [x for x in self]

test/test_conversion.py

@@ -146,7 +146,7 @@ class TestConversion(unittest.TestCase):
     def test_band_and(self):
         def band_and(x):
             if isinstance(x, Vips.Image):
-                return x.bandbool(Vips.OperationBoolean.AND)
+                return x.bandand()
             else:
                 return [reduce(lambda a, b: int(a) & int(b), x)]
 
@@ -155,7 +155,7 @@ class TestConversion(unittest.TestCase):
     def test_band_or(self):
         def band_or(x):
             if isinstance(x, Vips.Image):
-                return x.bandbool(Vips.OperationBoolean.OR)
+                return x.bandor()
             else:
                 return [reduce(lambda a, b: int(a) | int(b), x)]
 
@@ -164,7 +164,7 @@ class TestConversion(unittest.TestCase):
     def test_band_eor(self):
         def band_eor(x):
             if isinstance(x, Vips.Image):
-                return x.bandbool(Vips.OperationBoolean.EOR)
+                return x.bandeor()
             else:
                 return [reduce(lambda a, b: int(a) ^ int(b), x)]