Remove the alpha channel from the expected and actual images.

mgiuca-google · mgiuca-google · commit 2f139f2c0d83 · 2013-02-27T11:49:00.000+11:00
(This regressed when the PIL code was migrated to numpy.)
diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py
@@ -316,6 +316,8 @@ def compare_images( expected, actual, tol, in_decorator=False ):
    # open the image files and remove the alpha channel (if it exists)
    expectedImage = _png.read_png_int( expected )
    actualImage = _png.read_png_int( actual )
+   expectedImage = expectedImage[:,:,:3]
+   actualImage = actualImage[:,:,:3]
 
    actualImage, expectedImage = crop_to_same(actual, actualImage, expected, expectedImage)
 
