======================================================================FAIL: matplotlib.tests.test_image.test_rasterize_dpi.test----------------------------------------------------------------------Traceback (most recent call last):  File "/usr/lib/python2.7/dist-packages/nose/case.py", line 197, in runTest    self.test(*self.arg)  File "/home/tcaswell/local_installs/lib/python2.7/site-packages/matplotlib-1.4.x-py2.7-linux-x86_64.egg/matplotlib/testing/decorators.py", line 43, in failer    result = f(*args, **kwargs)  File "/home/tcaswell/local_installs/lib/python2.7/site-packages/matplotlib-1.4.x-py2.7-linux-x86_64.egg/matplotlib/testing/decorators.py", line 167, in do_test    '(RMS %(rms).3f)'%err)ImageComparisonFailure: images not close: /home/tcaswell/other_source/matplotlib/result_images/test_image/rasterize_10dpi_pdf.png vs. /home/tcaswell/other_source/matplotlib/result_images/test_image/rasterize_10dpi-expected_pdf.png (RMS 8.326)