Pillow/Tests/test_scipy.py

from helper import PillowTestCase

try:
    import numpy as np
    from numpy.testing import assert_equal

    from scipy import misc
    HAS_SCIPY = True
except:
    HAS_SCIPY = False
    

class Test_scipy_resize(PillowTestCase):
    """ Tests for scipy regression in 2.6.0

    Tests from https://github.com/scipy/scipy/blob/master/scipy/misc/pilutil.py 
    """

    def setUp(self):
        if not HAS_SCIPY:
            self.skipTest("Scipy Required")

    def test_imresize(self):
        im = np.random.random((10,20))
        for T in np.sctypes['float'] + [float]:
            # 1.1 rounds to below 1.1 for float16, 1.101 works
            im1 = misc.imresize(im,T(1.101))
            self.assertEqual(im1.shape,(11,22))

    def test_imresize4(self):
        im = np.array([[1,2],
                       [3,4]])
        res = np.array([[ 1.  ,  1.25,  1.75,  2.  ],
                        [ 1.5 ,  1.75,  2.25,  2.5 ],
                        [ 2.5 ,  2.75,  3.25,  3.5 ],
                        [ 3.  ,  3.25,  3.75,  4.  ]], dtype=np.float32)
        # Check that resizing by target size, float and int are the same
        im2 = misc.imresize(im, (4,4), mode='F')  # output size
        im3 = misc.imresize(im, 2., mode='F')  # fraction
        im4 = misc.imresize(im, 200, mode='F')  # percentage
        assert_equal(im2, res)
        assert_equal(im3, res)
        assert_equal(im4, res)