diff --git a/src/common/image.cpp b/src/common/image.cpp
index 40b0ab0325..cdda93c367 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -769,9 +769,9 @@ wxImage wxImage::ResampleBilinear(int width, int height) const
 
             // result lines
 
-            dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
-            dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
-            dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy);
+            dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy + .5);
+            dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy + .5);
+            dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy + .5);
             dst_data += 3;
 
             if ( src_alpha )
diff --git a/tests/image/horse_bilinear_100x100.png b/tests/image/horse_bilinear_100x100.png
index 390ed5843c..32a4d57f75 100644
Binary files a/tests/image/horse_bilinear_100x100.png and b/tests/image/horse_bilinear_100x100.png differ
diff --git a/tests/image/horse_bilinear_150x150.png b/tests/image/horse_bilinear_150x150.png
index b17ca3a603..5a669dddc0 100644
Binary files a/tests/image/horse_bilinear_150x150.png and b/tests/image/horse_bilinear_150x150.png differ
diff --git a/tests/image/horse_bilinear_300x300.png b/tests/image/horse_bilinear_300x300.png
index d4c5d06f76..ce7c824d42 100644
Binary files a/tests/image/horse_bilinear_300x300.png and b/tests/image/horse_bilinear_300x300.png differ
diff --git a/tests/image/horse_bilinear_50x50.png b/tests/image/horse_bilinear_50x50.png
index 6e7a7eee2d..defc189b8e 100644
Binary files a/tests/image/horse_bilinear_50x50.png and b/tests/image/horse_bilinear_50x50.png differ
diff --git a/tests/image/image.cpp b/tests/image/image.cpp
index 66023ff544..b94cfec690 100644
--- a/tests/image/image.cpp
+++ b/tests/image/image.cpp
@@ -1346,7 +1346,14 @@ void ImageTestCase::BMPFlippingAndRLECompression()
 }
 
 
+// The 0 below can be replaced with 1 to generate, instead of comparing with,
+// the test files.
 #define ASSERT_IMAGE_EQUAL_TO_FILE(image, file) \
+    if ( 0 ) \
+    { \
+        CPPUNIT_ASSERT_MESSAGE( "Failed to save " file, image.SaveFile(file) ); \
+    } \
+    else \
     { \
         wxImage imageFromFile(file); \
         CPPUNIT_ASSERT_MESSAGE( "Failed to load " file, imageFromFile.IsOk() ); \