Test matrix convert

Tests/test_image_convert.py

@@ -20,10 +20,10 @@ class TestImageConvert(PillowTestCase):
                 convert(im, mode)
 
             # Check 0
-            im = Image.new(mode, (0,0))
+            im = Image.new(mode, (0, 0))
             for mode in modes:
                 convert(im, mode)
-                  
+
     def test_default(self):
 
         im = hopper("P")
@@ -137,6 +137,37 @@ class TestImageConvert(PillowTestCase):
 
         self.assert_image_similar(alpha, comparable, 5)
 
+    def test_matrix_illegal_conversion(self):
+        # Arrange
+        im = hopper('CMYK')
+        matrix = (
+            0.412453, 0.357580, 0.180423, 0,
+            0.212671, 0.715160, 0.072169, 0,
+            0.019334, 0.119193, 0.950227, 0)
+        self.assertNotEqual(im.mode, 'RGB')
+
+        # Act / Assert
+        self.assertRaises(ValueError,
+                          lambda: im.convert(mode='CMYK', matrix=matrix))
+
+    def test_matrix(self):
+        # Arrange
+        im = hopper('RGB')
+        matrix = (
+            0.412453, 0.357580, 0.180423, 0,
+            0.212671, 0.715160, 0.072169, 0,
+            0.019334, 0.119193, 0.950227, 0)
+        self.assertEqual(im.mode, 'RGB')
+
+        # Act
+        # Convert an RGB image to the CIE XYZ colour space
+        converted_im = im.convert(mode='RGB', matrix=matrix)
+
+        # Assert
+        self.assertEqual(converted_im.mode, 'RGB')
+        self.assertEqual(converted_im.size, im.size)
+
+
 
 if __name__ == '__main__':
     unittest.main()