Merge pull request #3057 from storesource/RotateImagewithColor

Enabling background colour parameter on rotate

Tests/test_image_rotate.py

@@ -97,6 +97,18 @@ class TestImageRotate(PillowTestCase):
         self.rotate(im, im.mode, 45, translate=(im.size[0]/2, 0))
         self.rotate(im, im.mode, 45, center=(0, 0), translate=(im.size[0]/2, 0))
         
+    def test_rotate_no_fill(self):
+        im = Image.new('RGB', (100, 100), 'green')
+        target = Image.open('Tests/images/rotate_45_no_fill.png')
+        im = im.rotate(45)
+        self.assert_image_equal(im, target)
+
+    def test_rotate_with_fill(self):
+        im = Image.new('RGB', (100, 100), 'green')
+        target = Image.open('Tests/images/rotate_45_with_fill.png')
+        im = im.rotate(45, fillcolor='white')
+        self.assert_image_equal(im, target)
+
 
 if __name__ == '__main__':
     unittest.main()

src/PIL/Image.py

@@ -1749,7 +1749,7 @@ class Image(object):
         return self._new(self.im.resize(size, resample, box))
 
     def rotate(self, angle, resample=NEAREST, expand=0, center=None,
-               translate=None):
+               translate=None, fillcolor=None):
         """
         Returns a rotated copy of this image.  This method returns a
         copy of this image, rotated the given number of degrees counter
@@ -1771,6 +1771,7 @@ class Image(object):
         :param center: Optional center of rotation (a 2-tuple).  Origin is
            the upper left corner.  Default is the center of the image.
         :param translate: An optional post-rotate translation (a 2-tuple).
+        :param fillcolor: An optional color for area outside the rotated image.
         :returns: An :py:class:`~PIL.Image.Image` object.
         """
 
@@ -1851,7 +1852,7 @@ class Image(object):
                                              matrix)
             w, h = nw, nh
 
-        return self.transform((w, h), AFFINE, matrix, resample)
+        return self.transform((w, h), AFFINE, matrix, resample, fillcolor=fillcolor)
 
     def save(self, fp, format=None, **params):
         """