sorl-thumbnail unit tests fail by 1 pixel (!)

I'm using sorl-thumbnail in a Django 1.2 (currently 1.2 RC) project and getting a surprising failure of four of sorl's built-in unit tests. Essentially, the resized images are all 1px shorter than the unit tests expect them to be. See below for details

I'm developing on OSX 10.5.8 (not Snow Leopard) with Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12) and PIL 1.1.6.

Any thoughts what might be up?

Cheers Steve

======================================================================
FAIL: test_extension (sorl.thumbnail.tests.fields.FieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/fields.py", line 66, in test_extension
    self.verify_thumbnail((50, 37), thumb, expected_filename)
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/base.py", line 92, in verify_thumbnail
    self.assertEqual(image.size, expected_size)
AssertionError: (50, 38) != (50, 37)

======================================================================
FAIL: test_thumbnail (sorl.thumbnail.tests.fields.ImageWithThumbnailsFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/fields.py", line 111, in test_thumbnail
    self.verify_thumbnail((50, 37), thumb, expected_filename)
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/base.py", line 92, in verify_thumbnail
    self.assertEqual(image.size, expected_size)
AssertionError: (50, 38) != (50, 37)

======================================================================
FAIL: testTag (sorl.thumbnail.tests.templatetags.ThumbnailTagTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/templatetags.py", line 118, in testTag
    self.verify_thumbnail((90, 67), expected_filename=expected_fn)
  File "/usr/local/django/myprojectnamehere/lib/sorl/thumbnail/tests/base.py", line 92, in verify_thumbnail
    self.assertEqual(image.size, expected_size)
AssertionError: (90, 68) != (90, 67)

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sorl-thumbnail unit tests fail by 1 pixel (!)

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